Lack of camo from the start is irrelevant.
USF have nothing that would allow that camo potential to be used, pathfinders don't have any kind of camo ambush bonus and don't need to close in on anything, they have the camo "just because" as I don't see any tactical reason it would give any kind of advantage for them, they can't be used as self reliant squad and rifles can't camo, USF doesn't have any indirect weapons which would use the sight, they camo just like sov snipers, so you can't even scout stealthy.
I'm not saying the camo is useless, but it definitely doesn't have any purpose.
Recon pathfinders at least can call-in arty.
Bottom line is, JLI have a clear role and perform for the cost while pathfinders are more expensive, 4 men rifles with potentially better long range dps.
Did some test, and they seem to be pretty similar with the exception that Jaegers are slighly better at fight. In the only thing that pathfinders are better is basically on killing wounded since the Jaeger sniper has really long times between shots. Jagers are a bit expensiver, but pathfinders could still use some cost decrease to more or less 260 manpower cost. I wont find too logic go lower because his camo is the combat one,they camo sometimes between shots, something that reduces the chances of them getting killed in the middle of a fight by just hold the fire while other units get the agro.
Off-topic I aswell took some time to test and ironically found that penals are better than riflemen at almost every range and level unless at vet3 long range (seriously, at vet 0/1 CQC it was rape) and that tiger ACE is better than KT