Sly's just about had a comeback every decade since his mega-star days (Cliffhanger in the 90's, the three-way KO of Rocky Balboa, John Rambo and The Expendables in the 00's and Creed this decade). Each time pulling himself out of a (self-inflicted) rut with a genuinely good movie... wherein he immediately gives into his worst instincts and delivers a string of hot garbage - the exact same crap that took him straight to the bottom. Lather, rinse, repeat.
If any Creed sequel lacks Coogler, then I'm out. He was why it worked with respect to Sly (who certainly didn't "need" to come back after Rocky Balboa beautifully closed out the franchise and character). Bringing in Drago just shows Sly yet again hasn't learned from his past failures and taking the wrong lessons from his returns-to-glory.