As for intra-conference grad transfers, both would need a waiver from OSU to transfer to another Big 12 conference school. When Erin DeGrate grad-transferred from Texas Tech to Baylor for the 2019-20 season, she had to obtain one from Tech, and it wasn't easy according to Baylor fans. I can see OSU not granting the waiver simply to prevent 2-3 of their players from ending up at fellow conference school and having to play against them twice a season.
A few parts of that commentary are incorrect.
First, grad Transfer waivers are only needed if a player has previously transferred. If the player has not previously transferred, it is not required.
Second, the Big 12 intra-conference transfer rule does not apply to grad transfers.
Third, Erin DeGrate’s issue was not about a waiver. DeGrate had previously transferred from Louisville to Texas Tech, therefor she would require a Waiver if Tech offered the same graduate degree program and Tech took the position that they did offer such a graduate degree [even though the degree was in Baylor’s seminary and Tech as a state school does not have a seminary]. The Big 12 relied on an outside source to handle the ”same degree” question, the outside source determined that Tech’s position was ludicrous, Tech was heavily admonished by the Big 12 for fighting the transfer.
Fourth, OSU would only face a Waiver question on players who had previously transferred and the player was using an overlapping graduate degree offering.