JOC needed for low hour non-TR guys.
As for the OAA link for low hour applicants, not sure Jet2 HR would open the floodgates for all to apply if they only intended to take OAA grads - they'd just have gone straight to OAA. But nothing would surprise me.
With the thousands of applicants they've no doubt received they may decide just to look at OAA or similar integrated grads just to save trawling through all the applications.