As for OG & Pascal, the same reasons apply today that applied a few months ago. Both really good players, both about to get paid well more than they're actually worth.
The base reasons for not wanting either of them back:
Pascal - The salary keeps you from going and getting a legit 1st option that you can win with. Pascal can be a 1B on a 45-50 win team, might win you a playoff round (might). But you're hard capped with him paid like your #1A-B to an okay playoff team. You need 2 players better than Pascal to win a chip in my opinion. Can't be paying that #3 guy 50+ million a year.
OG - Similar really. He's a 3&D god. But on a contending team he's your 4th offensive option. Can you afford to pay your 4th option 40 million? Even ignoring the durability issue, I don't think so unless you've got a stud #1-2 type guy on rookie scale deals, or their 1st max deals (think Wemby on his rookie scale, or Shai making 33-40 million for the next 3 years)
It's not a matter of whether they're good players. It's a matter of whether they make you contenders now, and the worst thing we can do to hinder this BBQ generation is to take their shots and give them to Pascal, or max out our cap space by throwing a chronically injured 4th option in their with them. Move on, and go find what we need. Yeah, we need a guy similar to OG. But we need him on his 1st/2nd deal, not over valued and going into his 3rd like OG is. If you can't find that, going and getting some veteran specialists (OG was a top 3 wing defender this year, but there's a bunch of guys available who are a step down but legit plus plus defenders we can get) to bridge the gap until we can draft and develop some in house.