Before UPT, only LOE's may get written but they don't go into your 475 anyways. After training you might have a legitimate shop since OPRs are supposed to be written if you're in casual for a long time but that is rarely the situation. In short, the casual job and LOE's before UPT mean little (with possible exception below). It's after UPT that matters.
Double check with your CSS but I THINK: the one exception I could think of is if you generate an OPR for one of your guys by having him on casual for > 120 days but they would have to be doing a lot of good stuff or else the OPR is going to look like garbage and cause more harm then good. In that case, the Lt's are going to have to be very proactive about having their bullets together and knowing how making bullets and the OPR system works. That also may require some rocking of the boat as it's not the standard most likely but necessary if you want to get these guys some appreciation.
Lastly, thanks for taking the time to actually look out for the Lts who are doing great work. All too often, we talk a good game about "being good supervisors" (assuming you are one) but don't mentor or develop any officership for young Lt's and then they end up in a real shitty situation that was completely avoidable. Keep it up!