Once everyone has finished, it stops being the "at the start of..." part of the phase and becomes the normal part of the phase.
Do you mean by that after each player has consecutively pass? Another situation come to my mind.
We're at the start of the maneuver phase.
FP transfer a follower to companion who's already bearing two cards.
SP pass the
at the start segment, having nothing to do or play, but he's itching to use
Grima, Wormtongue soon
FP pass too, having nothing else to do or play.
Now, can the SP change his mind and decide to perform an
at the start of the maneuver phase action, or since he passed on the first opportunity we're now assuming we're just slipping into the maneuver phase. If so, the SP will be able to use
Grima, Wormtongue.
OR
SP must declare again that isn't performing any
at the start of the maneuver phase action and then we moved in the maneuver phase and the FP has the opportunity to neutralize Grima with an event like
Terrible and Evil /
Fury of the White Rider (or any possibilies for that matter).
Don't know if you see where I'm going or if I'm only complicating things
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