All the development money should go to frontrowers. The rest can be poached from league.
Now, a bit more seriously, I do rate Benn Robinson. And I think that Kepu is a decent tighthead (I know that for the #3 nation in world rugby you'd expect more), but Deans' obsession with playing Alexander at tighthead just shows that he never thought scrummaging was important at all. The few games where Deans picked a scrum-oriented forward pack I think they've done ok (first 20 minutes against France in 2012 or last year's TRC against the AB or last year's series against Wales). Basically, whenever Alexander started or came on, he would concede penalties immediately.
Basically their tightheads are either absolute crap in the scrum and decent in the loose or the other way round. You need him at least to be decent-decent or good-crap.