Some people are genetically predisposed to put on muscle mass easier than others. Those other can’t gain mass no matter what. If you feel your legs are getting bigger just with the light conditioning type strength work in the Transition period then I’d say to drop strength……Or do on a max strength protocol as will start in week 9 (1st week of the base period). If you again mass doing that then you probably bette lay off the weights.
Skiing and running have a strengthening effect for sure and for someone in your genetic shoes they may be all you should do.