Several reasons:
- The pathway to starting is clear for him. If it is blocked, it's only temporary.
- The value of the contracts are unknown yet, meaning, he could stand to either lose nothing financially by staying provided the club is fair offer-wise.
- WT being his junior club doesn't matter to some these days, but it appears to be some Tallyn has openly expressed is important to him.
- He is learning off the most credentialed hooker currently playing. There is no better mentor currently playing.
Just for starters.