Yes so what you're saying there is that inter-island does continue for Blue, but only as part of a triangular arrangement. This could be in response to the knowledge that GCI cant keep BE out of full ops on inter-island forever, and that as mentioned already, yealds are higher on other sectors like (speculation here) SOU.
Interisland is a funny one, pax almost expect a flight every 30 mins like buses, and this flexibility rather than infrequent capacity (ATR) is the order of the day...