Mason Parris might be a possibility as he is a good bet to be AA and we don't have one. I am not sure if Dean is an AA? and although probably higher ceiling than Geer, Dakota is a multiple time AA, so I would not do that.
Maybe I have forgotten some, but the only transfer situation like this I recall is Cale Byers coming in when Blake Rosholt was returning. Controversial (at least from Jakes point), but John let Byers wrestle at 197. I don't know the results in the room or remember if they had ranking matches or the decision was based on performance against common opponents, but Byers finished 3rd at NCAA I believe.