Correct both Quinn and Ledlum were grad transfers and the Portal never closes for Grad Transfers.
As for Taylor I believe that is correct that even after you sign scholarship paperwork you are still in the Portal until you enroll. Which was really odd because by being in the Portal you are still allowed to communicate with other programs even while you are signed to another. That is the whole point of the Portal, you don't have to ask permission to talk to another school once you are in.
But I believe that rule changed which makes sense. Once you sign grant-in aid/scholarship paperwork you are out of the Portal. Which makes sense, why would a school want to sign a kid and weeks before he enrolls he still allowed to stay in the Portal and is free to communicate with other schools?
The Division I Council on Tuesday approved changes to the notification-of-transfer windows in football and men's and women's basketball from a total of 45 days to
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National Letter of Intent
The council also adopted changes to NCAA signing rules that transition the National Letter of Intent program protections into signing and recruiting rules, effective immediately. The change was made at the recommendation of the Conference Commissioners Association, which previously had administrative oversight of the NLI program.
Moving forward, written offers of athletics aid will replace the NLI, and the previous formula for determining signing dates will be applied to those written offers.
Transfer prospects may be signed by a new school once their names are permissibly entered in the Transfer Portal. After a prospect signs a written offer of athletics aid, other schools that offer athletically related financial aid will be prohibited from recruiting communications with that prospect.