They don't need Skubal to roll the rest of the division, but if they want to have a chance at beating the Dodgers in the NLCS, they absolutely need him.
If Rolison was offensively bad they probably would have kept Wicks up, but his stuff+ this year is 99 and his xFIP is 4.27, completely inoffensive as a 3rd lefty in the pen.
Bregman is on pace for pretty close to the same bWAR that Tucker put up last year and he hasn't even had a hot streak yet. Zero reason to write him off