I think you will find that KDB's distance covered stats are among the best in the team: he runs 0.7km more than Dave per game. That doesn't prove he will adapt better to the work rate that Pep will want but it certainly does not indicate he won't. KDB is also younger and may have more in the tank.
The bottom line is that a lot of players will be asked testing questions by Pep's approach but we don't know how far Pep will adjust what he does to suit his new environment. We do know that the norm has been high levels of commitment and discipline, including positional discipline, so Dave is likely to have to adapt in a number of ways. Therefore, I don't think it is unreasonable to question whether Silva will adapt and prosper under Pep; what would be wrong, IMO, would be to think you know the answer. I'm very much 50:50 in terms of opinion on Dave and Yaya about whether they will stay / Pep will wan them. Both though remain ubder contract so if they choose to stay, I trust Pep will give them their chance and they will do what he demands.