No support, colosseum should be one of the hardest challenges in the game skipping to wave 5 for example gives you way to many supplies and will make colosseum a freeby, which shouldn't be like that.
On a side note: we could give higher ranks higher splinter drops for example the higher your rank the more splinter rolls you can have, cause 100k splinters is a bit of Endless and pointless grinding ☺️
Personally, I do not use a single supply till wave 6, and I guess most of people who understands col, does not need to use the supplies probably even till later.
I don't mind having an extra few wave skips for ranks, because first 5 waves is just waste of time to be honest, from wave 6 you start thinking on pathing and how to attack the monsters.
Personally support the idea, skipping these few waves would make it less demotivating :)