I'll never understand the why the term wheelsucking is bantied about like it is. A wheelsucker is someone who never has enough to attack. That can't be said of Roglič or Evenepoel, both great riders who use their talents to attack and win. Leipheimer was a wheelsucker.
If I'm leading a race (any race) and I'm alone in front with my closest competitor, AND I'm the best in time trials, why on earth would I rotate? I mean, I can see it if I'm 5 mins ahead with one stage to go, and I like the guy and want to help pull him onto the podium or some rare scenario like that. Otherwise, the decision is either drop them or follow them. Drop them only makes sense if you're feeling great and you know the other rider is laboring. Follow them is the right call in 95% of the scenarios. Losing 4 seconds in a sprint finish is nothing compared to the TT and potential mountain stage time losses. It also discourages them from attacking or upping the pace, all which help me save energy in a long stage race.
So I say he follows wheels unless he feels like it's another easy chance to take a chunk of time.