If you assume Warp skip, then this is way off. The best fighting units for the lowest turn counts are Caeda, Hardin, Abel and Frey, pretty much in that order. They have a combination of movement, availability and lance rank to clear the fastest ways for Marth to the throne. As early as Ch10, Lena and Wendell/Wrys take over a large portion of the required combat with Warp, and at that point pretty much only Caeda matters.
The notion of there being three different tiers above a God tier could not be more wrong, let alone Sedgar and Wolf (who have pretty much no time to grow) being at that point. Tier gaps are supposed to indicate significant differences in performance. If anything Sedgar and Wolf are three tiers BELOW the likes of Lena and Caeda.
If you take Warp out of the comparison and assume we're playing the whole game, units that join later become a tad more useful, but not much. You still only need the above Class A juggernauts to clear a path. Staff users become less important, and early joining growth units like Cord, Draug, Cain, and indeed Sedgar and Wolf have a chance to shine. But not much.
In fact, I daresay a NM and a HM tier list wouldn't be very different at all, whether it's Warpskip or not.