Word on the OSU sites are Martell was Urban Meyer's guy - brought in to run the offense the way Urban wanted it run. Ryan Day is planning on changes and Martell's strengths don't play into that the way Fields' do.
Also, there is a lot of chatter that Martell has already reached out to two teams he is most interested in. One is a Big 10 team, the other is not. The 2nd team is not in Texas and not out west. Miami has been named as the 3rd choice. This is coming from a poster who claims to know directly from the kid's family. And it was corroborated by another poster. Looks like the 2nd team is either in SEC or it could be Oklahoma. Penn State seems to be the Big 10 team.
Again, take it fwiw.