Release clauses are generally straight forward and I think anyone would struggle to find an example where the source transfer window being closed has held any weight whatsoever.
As for this supposed gentlemen agreement or whatever we want to call it I'm not reading too deep into it, there's just too much misinformation. Even with genkfan trying to clarify, if you read closely even he provided a flimsy explanation saying that there was a deal done by mail and then shortly after says that before this supposed agreement was "finalized (signed)" Toronto swooped into the picture so riddle me this batman. Without a finite understanding of what the actual case is I don't put any weight into the stories flying around. This will all come out in the wash one way or another so no sense speculating here among the armchair lawyers that have suddenly popped out of the woodwork.
Lastly I will say that as a TFC supporter I want this to get done now. I'm not sure why some are all of a sudden pretending to be FIFA peacekeeping police hoping for some magical solution that makes all parties happy. This may sound insensitive but I would be lying if I said I cared about any other team that isn't TFC. I don't care to make Genk happy, just being honest. Further, even if TFC and Genk work out some deal to have him move at a later time - how does this make Pozuelo happy? If you received a new job offer at double your wages and then had your boss say that you can't leave until you finish your current project at your same wage - how happy would that make you? Let's give up this fantasy that all 3 sides can be happy together in this.