Some corrections:
1) You can hear Chica/Bonny footsteps even in cams
2) You also have third method to Freddy. If Freddy have movement opportunity, she can move forward only if tablet isn't up. As long as you sitting on cams (even if you doesn't watch on her), she will not move forward. However if she in kitchen she can move forward and back even if you on cams.
My basic tactic for all game was just periodically check Foxy's camera and try to delay Freddy to kitchen as long as I can and after she laugh 4 times stare at Foxy (so Freddy can't move forward until I put tablet down) and if I hear footsteps closing right door(s) after. Something like that, and I beat game for 100% with this tactic.
This info was actual at least for ver 1.1.1
(And yes, this is mobile version, but I've 100% on PC also, but this was even earlier version)
