Would seem to be a disadvantage to people who havent chosen a prem or championship team so far
I picked a team outside the prem/championship/scottish prem too last week so theoretically am at a slight disadvantage but I think its pretty negligible in week 3.
If this came up later on and there was a bigger difference in the number of teams available to the remaining players then yeah I think we should wait.
Probably a good idea to put some sort of rule in place for this since international/cup breaks are going to come up reasonably often. I think it'd be significantly easier to just set a cutoff at maybe week 5? Could be a nightmare for whoever is running it if for example this happened in week 6/7 and there are still a bunch of people left and there isn't a consensus on play/don't play that week.
Up to Celtic though, if he's happy to send out a bunch of PMs then no need for the extra red tape