You ideally ride the omnium and SR differently. If doing an Omnium TT - save some beans once you've won. SR TT - it is usually worth going all in.

Junior will typically do well in the TT, and if it is stage 1 - he will be marked. Marked so much that winning a RR stage after that is hard enough - he doesn't try. But that allows other unlikely winners a shot they would not have in a single day as they get the opportunity to go because they are not seen as a threat. Winning a SR stage (vs omnium) is one of the easier ways to get upgrade points IMO for that reason.