lol @ Goobutt.
Ok Lanky aside from Ratliff name me one NT who would make a good 3 tech, in fact most teams that run a 4-3 have a 3 tech and they have a Nosetackle type who lines up in the A gap.
3 tech, explosive upfield guy, usually pretty quick off the ball and upfield type player. most 3 techs are really close to the 300 pound mark few of them are in the 325-360 range of the NT types, NT types are the widebodies usually very strong upperbody and not especially explosive for the most part. very different body types and skillsets. (in most 4-3 schemes)
Strong safety- usually the bigger safety, almost always hard hitter, solid takler, not as comfortable in the deep third (most of the time with a few exceptions) usually around 6 foot or taller and around 210-230
Free Safety- usually around 5-10 200-205 more covereage types more comfortable in space, usually better with a ball in their hands and not such solid tacklers.
Thats my point in actuality a 3 tech and a NT are extremely different, their roles, body types and skillsets very different, Ratliff is a rarity in todays NFL and honestly would proabbly fit far better in a 4-3 scheme or tampa two.