These wide receivers who are opting out of the bowl game and transferring shows a lot about their love for football. They can be practicing and getting better instead of playing video games for all hours of the day and eating munchies. Why wouldn't they announce until after the bowl game is over? If they are any good... coaches will find them and their current coaches would back them too.
For the guys transferring, there are a limited # of spots available at other schools, in large part due to the effects of the Covid year on eligibility with no increase in scholarships. A coach for another team can’t contact a player about possibly transferring until that player has entered the transfer portal. There have been a lot of fringe P5 players over the last 2 years that entered the transfer portal and ended up on bad G5 teams or FCS schools.
Say our #6 WR enters the transfer portal. That opens a scholarship on the team. Then the best G5 corner enters the portal. Heupel contacts him and he signs with UT. Our old #6 WR doesn’t get any offers from good teams so he contacts Heupel and asks to come back. Too late cause his scholarship has been taken by that star corner so he’ll have to come back as a walk on.