Issaka picked the Panthers over Michigan State, UCONN, North Carolina, and several others. He was another find of the wildly popular Jeff Hafley. Rivals
both rate him as a three-star prospect. Rivals also puts him as the 13th best recruit in New Jersey.
This ESPN Rise feature
seems to indicate that Penn State had offered, but I haven't seen that anywhere else today, so it appears to either have been incorrect or Penn State pulled the offer:
Max Issaka came out to the camp while recovering from a partial torn meniscus and still dominated every phase. Has great speed and a quick first step, but still needs to develop a counter move rather than just relying on his speed. Rutgers, Pitt, Maryland and Penn State lead, but the Nittany Lions have offered.