The Redbull does seem like a car built so much around max that it might be hard to adapt to. We've seen this before in motogp with Ducati and Casey Stoner where nobody else could ride the thing fast. The problem for Redbull is that all their eggs are in the Max basket, which is risky over time as Max could eventually move on. Perez could even come in and struggle. It seems unlikely - and I hope not as I like him - but you never know. Max is a bit rash and hasn't really matured much since he started. He's not one to drive to a delta, or try to preserve tyres as much. He will always risk a win over 2nd or 3rd. This is what makes it hard to see him winning a championship, but then, anyone not in a Merc right now you can say the same.
I do feel like Redbull would be a hard team to be the number 2 driver in just because it's all about Max so much and I really have taken a dislike to Christian Horner over the last few years.