As you rightly say the non bidders were rostered (? Fallback) so the bidders didn’t get loaded up artificially, though the trips the non bidders got and spacing thereof might have been sub optimal (in their eyes) to some extent.
I suspect for the first few months those who have got their heads round the system will do well and some of the junior pilots will I’m sure profit from the ignorance of some above....however I reckon by Easter or not long most of us (even me) will have grasped enough of the basics to make i decent stab at a bid and that’s when we’ll be seeing how JSS vs, seniority really shakes out.