It doesn't work quite like that. The vast majority of Kasich's delegates are REQUIRED by their states to vote for him on the first roll call regardless of if he drops out / endorses Trump / dies / comes out as a communist / etc.... After the first roll call, many are legally allowed to vote for whoever they want. It depends on how they were chosen as to who they will eventually support.
The 66 from Ohio were hand picked by Kasich himself. They are loyalists and will probably do whatever he tells them to do. The other ~160 are picked by state parties, local voters, caucuses, etc.... They may not be as inclined to follow lock-step with what Kasich asks them to do.