I have to agree as well. The old USN had many regulations in place for people transfering from the TSN, as it was a splinter faction having people transfer with full rank was acceptable and, in fact, desired. Now, the reverse route is not quite as simple.
An important aspect of the TSN is the RP, more so than in any other group. People might transfer knowing how to operate a ship, but a certain knowledge of our protocols is essential (and I personally believe it’s the main advantage of the Ensign exam).
Now, as I like to play devil’s advocate, let me raise a counterargument: when I returned from my year-old-leave, I did so (as del Pino) with full seniority, which meant I effectively bypassed all promotions of everyone who worked that time.