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Well, here's the thing about that... I agree with you to an extent, but it gets super-complicated that way.
There are 4-3 defenses which use the two DTs interchangeably and 4-3 defenses which use a 1-tech NT and a 3-tech UT. Then, there are 3-4s that are one-gap and 3-4s that are two-gap (like Crennel). A two-gap 3-4's DEs are pretty interchangeable on the left and right.
For my examples, I was going with a 4-3 where the DTs are essentially the same role and a two-gap 3-4. If you wanted to line up Vellano and Jones as a UT and a NT, I'd put Vellano at the 3T.
If you're running a one-gap 3-4, Jerideau could probably play NT in that role as well. He played a one-gap 4-3 NT at South Carolina and showed some penetration skills in the NFLPA game when he lined up as a UT.
Taylor Reed played WILB in SMU's defense, but not every 3-4 has a distinct WILB/SILB distinction. SF's ILB are a bit more interchangeable and it matters a lot what kind of personnel you have up front. A good front line frees up your LBs to roam more.
So, while I get your protest, it just gets waaay too complicated, at least for a random post on a message board.
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