Team trials assign the blame -- my assignment

From last Tuesday:

Had this auction in a KO match. How would you assign the blame, if any?

Unfavorable

♠	8 4 3
♥
♦	K 10 8 5 2
♣	A Q 10 6 4
♠	K J 5
♥	A 3
♦	A Q 7
♣	K J 7 5 2

West	North	East	South
		1♥	Dbl
3♥	4N	5♥	6♣
Pass	Pass	6♥	Pass
Pass	7♣	Dbl	All Pass

In practice I think the hands were a bit different than what's shown here. North definitely had a heart void, and we were definitely missing ♠A, but the rest is fairly roughly reconstructed. But, I think the analysis below applies equally to the hands shown above as to the actual hands we held.

I held the South hand. In retrospect, it's simply not possible for North to have the ♠A on this auction (in addition to the necessary minor suit honors). That would leave East with about a 9 count for his opener, and West with a 0 count. Not to mention North would have quite a lot for 4N.

While we hadn't discussed it, North made the excellent point that this sort of auction should be asking for a heart void. That's the only really plausible undiscovered feature that could make grand biddable. Also, the odds of making grand do not have to be that high for it to be a worthwhile bid since the downside isn't a small slam but rather a moderate penalty against 6♥X. Conceivably we could be off an Ace and still make it. Not to mention they might bid 7 themselves.

So, while I think North could have fielded it, mostly I think this was my fault.

East, a former world champion, said he doubled not really knowing if he was beating it, but didn't want his partner to sacrifice since he held ♠A. At the other table, our teamates did bid 7 over 7 so we would up with a big loss.