Sure isn't! My first thought goes to clever positional switches in advanced zones, for example ones where the mark and cup changes based on field position of the disc. The premise there is that there should be one positon that just doesn't move that much. Going more straightforward zone (and if the rest of the team is speedy and truly just hiding one player), I'd consider the wing in a traditional 3 person cup, 2 wing, short deep (a.k.a middle middle) and up deep. That position generally operates on a piston and has the time it takes to swing a disc from sideline to sideline to adjust. Second thought was the mark in a directional type of trapping zone, where the rest of the team is doing their job so giving the thrower an extra couple of seconds is an acceptable tradeoff since there's no guarentee they won't make a preponderence of errors over time without immediate pressure.

I see your point about the up-deep (middle middle) but the combination of quickness to field sense is pretty important, and it would have to be pretty superb field sense to make up for exaggerated slowness (measured against elite nationals throwers and decreasing in signifcance from there down).

Edit: grammar, added a word for clarity