The only reason I can think of as to why Cumulus didn't go alternative on 102.1 was because they were afraid it would take from I-95's numbers. If you live in Statesboro, you don't get 106.1 so if you want to listen to rock, regardless if that is active, alternative or classic rock, you are going to listen to I-95. You have to think that if 102.1 offered a different style of rock (modern alternative), it would likely pull from WIXV.
WIXV has the same playlist with a few random adds that they had in 2005. Same Tom Petty songs, same Ozzy songs, same Pink FLoyd songs. Can't call I-95 a classic rock station because they really don't go that deep at all. I don't think they even play ELP, Jethro Tull, or deeper cuts from Floyd. I can't call them active rock because their new rock tends to be a handful of active rock artists that basically sound like pissed off country singers.
102.1 as alternative would probably force 106.1 in a classic rock direction and that would kill 95's already weak ratings thinks to The Hawk, Quality Rock and to an extent, 1061.
With that all being said ----- Dumb move by cumulus. Cumulus does alternative well with a slightly harder edge to it and with 102.1 signal, it would cover areas in the market that hasn't had a modern rock station since the wave 1069 days (isn't that like 15 years?).