I can agree with all of that.He had also had an evaluation from McNair after the maneuvres of 'Good, Division probably his ceiling' Simpson gets 'Untried should do well' btw
Eisenhower is kinda accidentally inevitable. He is a major player in the US mobilisation plan especially in industrial mobilisation then in early 42 heads War Plans, prior to that had been the lead army player in an attempt to set up a joint army navy command in the Gulf which fails on Navy intrasigence, goes to London to evaluate ETOUSA which is the US command organisation for the ETO, and gets the job shortly thereafter. Goes to command North African invasion, which has to be an American because of Mers ek Kebir and is replaced as ETOUSA by Frank Andrews who is killed in a plane crash, and then by Devers. then comes back as ETOUSA which becomes SHAEF.
As ETOUSA he also has to manage the USAAC/F which is by far the biggest component most of the time.
In the interim The Med Theatre is created with Eisenhower which is in part a rejection of the idea of a common Bomber force and Pointblank, which requires an 'Independent Air Force' which means that as the US ground troops are in the Med and the Air forces in England are doing their own thing ETOUSA is sort of redundant.
And everyone who matters in Europe and the Med gets on with him and can work with him which is essential. Once he is there there is actually noone better. Tedder, Morgan, Gale, Robb, Ramsay, Vandenberg and Smith are all in on Torch or its immediate aftermath so its less Eisenhower's appointment as the appointment of an entire and proven command team with initially Montgomery as land force commander but he has worked with them all for a year or so as well. Leigh Mallory and the AEAF starts working onpre invasion prep in 1943.
Ikes job is not operations its HR, logistics and managing up to the CCS Committee and politicians. He has Army Group commanders and they army and corps commanders and Naval Air Force equivalents to do the rest. When he does get involved in 'operational' decisions he is either sanctioning what his subordinates have proposed or wrong, and smart enough to realise that quickly. This is different from the Pacific Theatres which are much smaller and less continuous operations at scale.
Neither Brooke or Marshall is an obvious alternative as they have global wars to run and better things to do and dont have the relationships with everyone else involved.
I can find fault with many of Ikes decisions but only with an extra large helping of hindsight and a large glass of 80 years of research which he did not have.