If last year was his best season in the past 5, then I guess that's as god as it gets? I'd start Wicks first 20mins, and bring Mannah on then to do his thing. If Tim can get through 50mins in the middle of the game, I reckon it would make more of an impact on us than playing his time at the start and end.
Wicks doesn't have to be the best defender to soak up the first 20mins when no-one around him is tired. It's possibly the best time slot for him, if you're worried about the odd defensive lapse? And imagine how fresh Tim can be coming on after 20mins - maybe he can have an even better season in 2016?
Tim's a 50min player, no way should he be captain when we've got the NZ vice-captain 80min player in our side. Let Tim be "Club captain" and do all the charity stuff, and give the squad a chance to play under a real game day leader!