Yes, I think Tom is actually better suited (size wise) for LT. So unless you plan to grab Alt or some other prototypical LT, I'd have Tom compete with Walker at LT and compete with a rookie at RT. Then pick the better pair.
I tend to prefer picking the key spots in the first round: CB, WR, EDGE, OT, and QB. Picking a S, LB, DT, G, C, TE or RB in the first typically means the person has to be "special" to bring back the same value at that position. Surely, a DT with heavy pass rush capabilities will do that. Or a TE that moves like a WR. But those are pretty few and far between.
It is much easier for people at those other spots to produce immediate value. So our need at those spots looks like:
QB: almost nothing. Certainly not a 1st rounder
WR: Could use that "#1 stud" type, but we have great depth and young talent
Edge: Have 3 strong DEs, one good one on IR, and one decent development candidate. Hard to spend another 1st round here.
CB: Alexander and Valentine is a good starting tandem. Assuming he can stay healthy, Stokes provides more upside than Valentine (or at least competition and a quality backup). You can always use more CBs, but we have decent depth. And last first round CBs (Kool-Aid and others) look pretty strong too.
OT: We have Tom and Walker. Tom is pretty set at one position. Walker was good last year and may continue to grow and develop. But he is replaceable. And there is zero quality depth (some development pieces that might hit, but odds are low).
So of those "key spots"... if I'm going to spend 4 draft picks to move up to the top of the draft, I'm going after someone like Alt.