So the question is: can the new player seats in pos.3 and pay ONLY the SB and player in pos.5 pay the BB? Or the new player must wait?
For what I know, nobody can pay only the SB, everybody must pay both the SB and the BB, it's for the protection of the player and of the game (to not favor the player who will not pay the BB while the others do)
When you start the tournament and draw the button, does someone not pay the small blind without paying the big?
Also when new entries take their seat, they do not always pay the big blind before the small...unless your house policy is to have them post in tournaments (which I personally am not fond of).
When you break a game, you do not know for sure what position the player was in before they moved. They may have just paid the big blind or the small blind and now they might draw the blinds again. It's luck of the draw.
However, when you are moving a player from worst position they will never go into the small blind. There will be at least 2 seats open if you have to move a player, so that player will go into the one that will be the big blind first. Small blind would be the last seat to pay the big blind.
The only time a player should have to wait to play is if it will mess up the blinds.