If you are truly eat what you kill, there is delay from when you do the work until your group gets paid for the work that you did. Your actual collections haven’t come in yet, it will ramp up over 3-4months. If you are getting paid anything at all in the first 2months, your group is lending you that money to live on. When your collections actually roll in, the money they lent you will be deducted from your share of collections (also over a few months). In effect, your future self is giving your current self an advance. In the end, you should get the full amount. Why do you feel like you won’t be paid the full amount? There should be a clear formula for how much you get paid (eg $$/unit x units/month = $$/month).
The upside is that you will continue to get paid for a few months as your collections trail off when you quit or retire.
I’ve been in 2 eat what you kill groups and when I started the groups didn’t front any money at all, I just waited. Nowadays our group fronts some money at the start to help new hires get by.