Using
Spyke as an example, lets say that one week he is on the player-banned list. (not uncommon)
That week, the players vote through the format election, and decide that
Spyke is FREE! So now, the following week in
ELO has
Spyke being playable.
During that week, a new format election has begun. "The characters are selected from the top characters from the previous week’s top clans, plus the ones banned after the last vote."
The previous week
Spyke was banned, and hence not one of the 'top characters'. Nor was he 'banned after the last vote', the reason he's free in the first place. Not fitting either of these criteria, he escapes the format election.
If a character goes from being player-banned one week to being playable the next, they will always have a minimum of 2 weeks back in the game as they do not appear on the format election for a week.
It is for this reason that when cards like
Spyke and
Uranus get released from 'ban land', they always have an extended stint of at least 2 weeks before being struck back down by the ban
Hammer. These cards usually get abused in the week that they become playable, hence why they appear back on the format election the week after (but remain usable through that week)
If that made sense to any of you who read this, congratulations. NOTE: I agree that the system is rather odd.