User blog comment:B214/Question & Answers 5/@comment-168.28.180.15-20150914130530/@comment-1359322-20150914154316

For that first one, that depends on the strength of the servant back then and the consumption required. To the second one, nothing will happen to the Devil or Evil Pieces. With the likes of Tannin, Rudiger, Sirzechs' team, Ise, Yuuto and Gasper, none of them have any side effect even after being stronger. The best example would be Kiba, the current him is clearly worth more than one Knight Piece, yet you don't see that there's anything going wrong for him. Another one would be Saji.