It sounds like Ty was issued a new visa under the 4 point elite league rule before the problem started and therefore it was only suspended where as the doubts over Taylor's fitness meant no visa was applied for therefore he had not got a valid visa before the problems with UKVI
There was a piece in the speedway star this week where Alex Harkess said that some riders were in possession of a valid visa and they are in the country and ready to ride so the fact that Ty is in the country and has been practicing at Scunthorpe tells me that Ty is one of those Riders
Covatti didn't even look good enough for a reserve berth at Sheffield at the end of the season never mind the number 5 race jacket. He had 1 good meeting all the time he was at owlerton
Sheffield can be left out of this argument, go and have a look at Arthur Sissis's twitter and it's stated on there by Arthur himself he doesn't need a work permit as he rides on an. EU passport (Greek I believe)