I think you would have to go back to 1991 for the last time Dundalk have kept together the best players from a sucessful season. We won the league that year, and most stayed on.
What a change it will be to have the same quality players onboard for a second season, usually its a clear out with less than 5 staying. From 2012, only Cherrie was a starter, Mountney was the other one, he played about half.
I'm not so sure about Derry challenging, seem to be going through a transistion, as for Limerick, I think they'll be happy again to consolidate, but when they return to the Markets Field, I'd say it will be a different story.
Towell signing is a huge lift, looks like the main sponsors helped out, hopefully him alone with attract even better players.
Plus it will also give the shed boys another good year to sing about not selling him........