Removed irrelevant personal debate.
Starkist, I disagree with everything you've said, as described below. I also doubt the retention bonus for senior engineers, but that is irrelevant.
I have experience at two utilities and two plants and I have a vast network of ops and engineering personnel to safely say that if his goal is SRO;
NLO---RO---- SRO or NLO----SRO is the preferred path vs engineering to SRO. One is a guaranteed path, the other isn't. And in general, when comparing apples to apples, ops makes more than engineering. He knows this already, which is why he ONLY asked if he could do NLO---SRO, which of course the answer is YES.
Stating "senior" salaries and what not is irrelevant in regards to a person that is entry level.
Also, "either path" as you say, will NOT give him good experience. Engineering will not give him any good experience towards SRO what so ever.
Justin