@catracho504 – To the best of my memory, the team you have in mind haven’t explicitly moved over for Red Bull before. And if you want to consider the influence of engine suppliers, then one could argue that Ferrari have 4 cars on track as well.
@nesh – Having more cars on track naturally allows a team to subtly affect the outcome of a race. Those “5 seconds” lost while lapping a slow car may seem insignificant, but could result in gaps between drivers (one from a competing team, the other from the affiliated team) shrinking, precipitating a change of position, with potential championship-altering consequences.
In this case, having the Toro Rosso move out of the way enabled Vettel to avoid losing time, expending effort and risking damage by being bottled-up behind and conventionally overtaking the slower car. In other cases, having a Toro Rosso car briefly hold up frontrunners while being lapped, then subsequently waving the RBRs by, makes for a significant advantage in on-track battles.