Fair enough, if you google 'Free agents can be signed by a club at any time during the season, if they had been released by their previous club before the end of the transfer window.' you get 670,000 results, I'm sure there's at least one source you'll be happy with.
Wrong fella. I can't tell you where it's not, because it's not anywhere, you're going to have to read it to see that it's not there. The cut off for him signing for another domestic club is May 1st. Check the FA RULES RELATING TO PLAYERS. It's section C It opens as a pdf which is why I can't give you the link but it's on google.
