Sulla marched on Rome two times. In OTL, this was provoked when his rival Marius tried to trip him of his army, declared his old reactionary "reforms" (how is anything conservative a reform?) invalid, and then kill a bunch of Sulla's friends and Senate supporters. Sulla marched on Rome again and was given dictator status.
Well, suppose Marius just decides he's getting old and there isn't a need to actively stop Sulla. He just focuses on getting rich in office and promoting his own agenda when anything he finds ideal gets... say 3/8 of the Senators (most Senators were sympathetic to the Optimates, but not all) and abstaining from anything else.
This leaves Sulla with his many of his conservative policies in place. He's likely going to win the war like OTL (unless no civil war to think about suddenly butterflies his command decisions and victories) and probably get a third term as consul. He would have much of Greece, Illyria, the Asia Minor, and Aegean Islands as a quasi-fiefdom. Sulla would also have considerable support in the Senate, which means considerable control of Rome itself. However, he would not have an excuse to march on Rome and force all of his agenda through.
Well, suppose Marius just decides he's getting old and there isn't a need to actively stop Sulla. He just focuses on getting rich in office and promoting his own agenda when anything he finds ideal gets... say 3/8 of the Senators (most Senators were sympathetic to the Optimates, but not all) and abstaining from anything else.
This leaves Sulla with his many of his conservative policies in place. He's likely going to win the war like OTL (unless no civil war to think about suddenly butterflies his command decisions and victories) and probably get a third term as consul. He would have much of Greece, Illyria, the Asia Minor, and Aegean Islands as a quasi-fiefdom. Sulla would also have considerable support in the Senate, which means considerable control of Rome itself. However, he would not have an excuse to march on Rome and force all of his agenda through.