Firstly we didn't change host even though both captains+teams agreed it was laggy so firstly my bad on that.
Also:
Rule 7. If a player disconnects from the game then they cannot be replaced by another member of their team until the end of the half. The disconnected player may re-join the match room and be put back in by the neutral overseer/host straight away.
So I should of waited for Aidan to come back and put him on.
I can only hope to do better next time and not haste to make decisions.
Sorry all