I think its very much the same
Ah. not trying to be argumentative, but that's not the same. The rules for US->UK in general are less stringent after Brexit. You said that they are more stringent. Just wanted to clarify that - I think it matters for US and MLS guys in general making the jump to the UK.
In regards to Gloster, not saying he meets the qualifications, but he is closer post-Brexit than he was pre-Brexit.