The Raptors drive a hard bargain, so I would guess they say No, despite that being an overpay, because they are greedy. OG has a player option next year, so trading for him is a half year rental, then he's going to get 20-25m per year from some treadmill team this off-season. 3 FRPs for a rental like that is insane, plus he's just a defensive wing and not much more. 4th option on a championship team? maybe, but that's not worth 3 FRPs.
Toronto seems to produce some good players, but they can't ever get it together for a championship run, except that 1 Kawhi year. Siakam is really good, but not a guy that will lead a team to a ring. They are going to be stuck maxing him out and looking for someone to complement him, but won't likely find that player and continue to be a 5-9 team in the East. They need to trade what they can and acquire more assets until they can make another Kawhi type trade to get that superstar.