It is hard to argue that patience was not the best strategy for Kyllington's development.
D men need time to develop, and while the average age of D men is younger than it used to be, it is still around the 26 year old age range. At 24 Kyllington is tracking right where he should be.
https://www.tsn.ca/nhl-increasingly-...emen-1.1148442
I think that he is a more complete player now, for having had a tight leash, and for having player fewer than 100 games before the age of 24.