Timleck seems like a lock for an OA spot. He should be a pretty good offensive player this year - held back by injuries last season.
Timms would be next on my list. Obviously last year didn't go well but 16-17 Timms is light years ahead of the other options and a very valuable player, even if he ends up being dealt to a contender at the deadline.
For the last spot, I lean Dow or Osmanski. Osmanski is solid, not exceptional, you know what you're getting. Dow outscored Paquette 20-17 at even strength last season. He got way less ice time opportunity and was 5 points less even including PP/PK time. It was his first year in the O vs. Paquette having played 200+ games. Paquette was minus-36.
If Paquette has any trade value from being a relatively high OHL pick and NHL drafted, great. If not, he's still the 5th of 5 options in my eyes.