The downside at this point is perception (right or wrong). Many of the same people who want Allar (I'm one of them) will skewer Franklin if Allar costs them a couple of games and the team finishes with 7 or 8 wins instead of 9 or 10.
If you could choose 10-2 with Clifford starting the remaining games or go 8-4/7-5 with Allar which would you take?
Your question answers itself. If one guy gets you to 10 wins and the other guy gets you to 7, then the first guy by definition gives you the best chance to win, which is what it's all about. This is not a close call in my view.
Franklin's comments at the presser today were exactly what you'd expect. If Clifford is healthy, he starts.