Worse for who is not logged. This is a reason to ensure that users spend more time on GKO 
Obviously, however, must give the possibility to set substitutions before the matches. This is to avoid of disadvantage excessively users who can't see the matches.
True, I spent many hours to set the match before and the opponent will change it in one minute! This is still game, not real life. Please, think of it
If it is so, I will propose to choose the date of the match. Home team will decide what time and opponent must accept this? There are two completely different things "spending time in Gokickoff" and "watching match live on Gickoff". You have other advantages for being logged in, for example changing energy points into G... Anyway, this will make pathology such as setting tactics against the potential changes of the always-logged-in opponent. This is very bad idea!
