I too think this. He graduates 8th in his class. Then after the Pegasus stuff, gets sent to Betazed, which is about as "Lay low" an assignment as there is, that Pressman likely had a hand in, & probably came with Lt Jr grade bump. Then an opening with Lt. bump happens on the Potemkin, that Will jumped the line on, with Pressman as a hefty referral.Considering dialogue from "The Pegasus" put Riker just out of the Academy when that mutiny occured, Riker went from ensign to XO of the Federation flagship in just 6 years. That's remarkably fast, especially when you consider he was also offered command of the Drake before he took the XO spot on the Enterprise. (Dialogue from "The Arsenal of Freedom".)
I do think a possibility of his meteoric rise through the ranks is not just his skill and natural leadership abilities, but Pressman could very well have been pushing things a bit faster for him behind the scenes, as a sort of 'thank you' for being one of the only officers who backed him during the mutiny. While never stated on screen and is just a theory of mine, it would explain Pressman's line to Riker of 'I made you and I can break you'.
Then Nervala IV & his major heroics that nearly cost him his life. That almost certainly got him commendations & a bump to Lt Cmdr. Dude looks like a wonderkind, So DeSoto grabs him up to the Hood as XO
So then 1701-D comes up, offering a bump to Cmdr, OR a spot as the center chair on the Drake, but maybe also only as a Cmdr.
It's super fast, but with some heroics & a big admiral in his pocket, seems doable