They did good things in getting Werner and Hughes to beef up the dline. They also signed RJF if i remember correctly, and defense was their biggest problem last season.
I expect Fleener to take a huge leap forward as a receiver, wouldnt surprise me at all if he was a top 5-7 TE next season. I think Pagano is a good coach, he'll keep them moving in the right direction. Their running game is the biggest question in the offense next season, theres an excessive amount of mediocrity there
I dont think CK steps back at all, but i could definitely see a plateau for him...maybe even just because harbaugh isnt going to ask him to do a whole lot