I think
@Lascaris explains in a very clear and logic-proof manner the current situation of Greece vis-a-vis Turkey.
I would like to add that in TTL, Greece has more human and material (money including) resources. The Great War ends sooner, so its a net benefit in both men and money. Not to mention that the bulgarian-occupied parts of Greece are reclaimed sooner. Without a Russian Civil War, Greece doesn't send a corps to Odessa and Crimea either.
Once again, we should take into account the complete collapse of the Ottoman Army. We know the broad strokes of the campaign and if we take into account the OTL, we can make certain logical assumptions. For instance:
When Yudenich broke his opponents and reached Sivas and Diyarbakir, there were 2 Ottoman Corps in southern Mesopotamia, with 4 infantry divisions and 1 brigade. Before the February Revolution there were plans for a russian attack towards Mosul to help the British. I don't see why this wouldn't have taken place, if we take into account the huge superiority Yudenich enjoyed in numbers, material and logistics. You got 166,000 Indian and British troops advancing north by extensive use of river steamships and a russian corps advancing south, while the main russian army as per the author's word reached close to Diyarbakir closing the main road. Ottomans don't have steamships nor trains in Mesopotamia. In a bad senario, most of their army is bagged. In the best case senario, they completely lose only what forces they leave as a rearguard and all their artillery. In a semi-decent senario they lose half their divisions and their whole artillery that is moving slowly.
If this is the case for Mesopotamia, then what should we say about the Persian Front? In spring 1917 the ottoman 13th corps with the 2nd, 4th and 6th ifantry divisions is located deep in Persia, in Hamadan. Before the February Revolution, Yudenich was planning to send a corps-sized force against them, while the other previous mentioned corps would advance to Mosul. These 3 ottoman divisions are gonners. The only way to escape destruction would have been to become magically motorized and magically built paved roads from Hamadan, across the Zagros Mountains to Mesopotamia.
That brings us to the Sinai Campaign. The forces there - much smaller without a russian collapse and units from Caucasus- can use the single-track railroad to escape north, while sacrificing a rearguard in Gaza, as they have to march first to the railheads and then move up north
one regiment at a time. While they escape complete anihilation and live to fight another day in Aleppo, they have to hold more than 12 months until the end of the war. A much smaller Ottoman Yildirim Group will have to face the same to OTL British field army for a whole year. Attrition is bound to be
worse than OTL.
If an OTL Army of X size faced an army of Y size and endured Z casualties over a period, then in an alternate timeline one army is X/2 size while the other remains basically the same Y size, then casulaties wont be Z, but lets say 1,5 Z.
As mentioned before, the ottoman 3rd and 2nd armies are destroyed by Yudenich. Whatever front the Ottomans manage to built in late 1917, will face horrendous casulaties (in addition to the destruction of 1917) in 1918. How else can you hold a front with less troops, greener troops, fewer guns and fewer animals then before, if not by paying in blood? Before ( 1914, 1915, 1916, 1917 campaigning seasons) , you had more manpower, experienced cadre, equipment and still was defeated handily everytime by Yudenich. If you want to stop Yudenich in 1917 -1918 Yudenich from overruning the whole Anatolia, you have to make absolutely horrific sacrifices in lives.
When the summer 1918 and peace arrives, there isn't an ottoman army left in contrast to OTL. Much, much worse human and material losses. Much more land occupied. Hundreds of thousands more turkish refugees. Sivas and Erzurum in OTL were the heartland of the nationalists. Now these provinces host the russian flag. The turkish nation is bled white.
All things considered, I don't think we will see more than irregular activity and not a regular army. Until some years pass and the turkish nation recovers, there can be no proper war against Greece (that can field 300,000 men) or even against the weak italian and french presence. Overall, I do consider the turkish situation
completely different to OTL.