If you disagree with me, fine. That is what a forum is about. But debate the merits instead of attacking perceived qualifications. It's a pointless discussion if you don't (and, for the record, I have built a player that did pass coverage in zone, and I know what skills worked for those plays and what didn't).
Or, if you want to go that route, the ultimate end game is how much code have you put together for GLB2? I guess none, so we should all stop posting in this forum immediately and leave it to Cdog and Bort.
On your man needing cover tech thing, yes, you can get away with a low cover tech build, but a head fake/route tech/route elusiveness build will obliterate you. You can get away with low whatever for any build at any position tbqh. It will strengthen you against builds not built to exploit your weakness, but leave you completely exposed to those that are. So yeah, you can point to any build and show examples of it working, but someone else could probably find examples of it not working.