I ask as there are usually 8 starters in a team (he said opening himself to contradictory evidence) although Tour Down Under only had 7 per team, so it might be the riders who represented Trek at the Tour Down Under - although none of the signatures look anything like the names of the riders apart form top right which could be "Ruben" - Ruben Guerreiro, and maybe bottom right, a very elaborate "JP" = Jarlison Pantano
The rest of the TDU team were:
Edward Theuns
Peter Stetina
Mads Pedersen
Koen de Kort
Laurent Didier
None of the signatures look remotely like that!