Is The Yellow Color Really Medium Difficulty On OSDs?

[HighFlyer15]

I've got a couple of friends playing on our private server and we're having a lot of fun with the OSD(Orbital Supply Drops) horde mode.
We've done a couple of Blue as we know those are the easy ones and we can't really figure out which comes next.

As we take down a Blue OSD the levels of creatures never exceed 20-30ish, making it very easy, but when we checked the wiki yesterday it said that Yellow would be the next step up, so why is Yellow difficulty full of lvl 280-300 creatures? That's not a difficulty curve, that's an insane spike.
Is this just another unbalanced Wildcard thing? Like how the bosses on the Island used to be much stronger and beefer?
I could understand ramping the levels up on the final wave to make it the last stand, kind of thing, but starting off wave 2 with Spinos, Rexes, Enraged Trikes and Pteranodons at lvl 300 is just crazy.

We could easily download our lvl 480 bred boss Rexes/Theris and stand a chance but we were really hoping to use what we've gathered and tamed on Extinction but I suppose that's a big no?

I remember seeing a livestream of the devs doing a Legendary difficulty(purple) and it was nowhere near as stacked with creatures as the Yellow we attempted yesterday, as the devs beat it easily with a couple of Gigas and people on foot.

[Elliebird]

The difference between blue and yellow is pretty large, yeah. I don't know if they intended it to be such a jump in difficulty, but blue drops give you next to no indication of how tough yellow and red ones will be.