The C's and Raptors are the 7-8 seeds but just 4 games back of the 3 seed (and 5 games back from a 2-way tie for 1st). There's a real chance for the C's to continue this good stretch as their schedule doesn't look too bad over the next few weeks.
I don't think a 4-5 seed is out of the realm of possibility
To their credit, I'm surprised CHI and CLE have held on to their Top-4 seeds (Bulls 1 seed!) this long into the season. With that said, I also don't view them as "invincible" and probably would still prefer to face them in the playoffs before a healthy Bucks or Sixers team.
Hard to really say about the Nets right now, they might be having a lot of their own internal problems even when KD comes back. Of course I also don't want to face them in the playoffs early, but we may not have to worry about that anyways the way it's going for them now.