208 Sqn was folded in 2016 when IV Sqn was to be able to take the student output. The T1a and T2 are totally different airframes (avionics and performance) and so the QFIs from 208 would need converting to T2 before they could instruct - some made the crossover, some went elsewhere and some went back to the frontline or staff jobs.
Honestly, the closure of 208 was not just taken on a whim. There was not enough hours on T1a to keep the flying rate of 208 going and those hours were needed for other things - such as providing live radar and BFM targets for 29 Sqn’s OCU sorties! The only way to fix that is to get some jets to replace the ones that the T1a is used for, but again that also takes time. One of the biggest T1a tasks being Air Support to Defence Operational Training (ASDOT) -
https://defense-update.com/20180318_asdot.html