Castleton has 1 good year, and suddenly it's "make them the 4th permanent Primelink participant". What?
Castleton's all-time record against the Primelink teams? 4-10. The combined score of all those games? 25 goals for, 79 against. How many of those 10 losses were by a single goal? 2 of them. When was the last time Castleton beat a Primelink opponent by a multi-goal margin? Never.
Yes, Castleton is have a great season. Nobody is taking them lightly this year. Nobody. And they have shown that on a good year they can compete with Norwich and Middlebury (although they've never managed to keep it close against Plattsburgh). But they are far too inconsistent to ever consider making them a permanent 4th team. We are, after all, only a year removed from them going 9-12-5, and 0-3 against Primelink opponents by a combined score of 6-21. Talk to me after a few years of consistency, and we might have something to talk about.