I think that makes sense to be honest, the 30 and especially the 32 get heavier loadings than the 20 (even though that regularly has a full bus for small parts of the route) and the LE's will be well used on those routes.

I am guessing that LE5 and 6 will remain on route 20, with two 2006 SP's from the Stranorlar batch joining route 20, or alternatively a permanent allocation from LC1-5. Hopefully it won't be the latter!