I confess I don't follow Carlton closely but was it not because Bolton in all his wisdom moved wetts forward and essentially stuffed him up? After previously bossing it in his natural defensive position
Yes, a poor decision by Bolton, in hindsight.
Bolts was trying to plug a gaping hole up forward, and thought Weitering could be a swingman. It did great harm to the kids confidence in 2017. Mitch McGovern is now the swingman that Bolts wanted in 2017.
However, it seems everyone at the club now is on the same page, Weitering is a key-position backman. He should remain there.