If we're going to nitpick about facts, there is nothing in the original facts to say that seat 10 made an "unclear statement" so I'm not going to assume that there was. For all we know, he could have YELLED "CALL", but the dealer was on auto-pilot and took in the mucked cards and shuffled anyways. And we know how fast dealers can take the cards in... I don't think we can assume that both players sat idly by, looking into space, before trying to stop the dealer. I also don't see from the facts that seat 8 is even questioning whether seat 10 called. And since "the seat 8 and 10 cards was still i front of the table and not mixed with any other cards", it doesn't appear that either player failed to protect his cards. Clearly, we can't expect the players to protect the deck in the dealer's hand from the MUCK as well -- that is the dealer's job.
In any event, my point was simply that in situations that result from what is almost wholly the dealer's fault, the board should be dealt out whenever possible. I do not agree with splitting the pot except under the most extreme of circumstances - having unseen mucked cards mixed in with the deck is bad, no doubt, but not serious enough to void the hand. Note that the board hasn't even been dealt out once, so it is not like any player is getting a second crack at winning the hand.
Also, I'm not saying there was any collusion in THIS particular case. My feeling is that this was an innocent mistake by the dealer. But I presented a hypothetical example to illustrate a related but altogether different point.
In my view, in general, voiding a hand and splitting the pot due to a dealer's "carelessness" in this type of situation is a dangerous precedent to set. Consider that the historical basis of many "modern" dealing procedures is, in fact, to protect all players at the table from possible cheating that involves the dealer (e.g. no rolling of the deck - this is to prevent "peeking" by the dealer, ensuring the deck is cut - to better ensure a random deal, no rabbit hunting - prevent dealers from culling the deck, etc., etc.). If you have read some of the old books on "how to cheat at poker" or "catching poker cheats", you will better understand what I am getting at. Many rules and procedures were developed to maintain the integrity of the game, and we don't have separate rules for "trusted" casino dealers and non-casino dealers.
Again, I am NOT talking about Spade's case. But can you not see how routinely splitting the pot in situations where there is an all-in called, followed by a rogue dealer's deck handling error, can potentially set up a freeroll for the first player that goes all-in? Dealing out the board where both hands are identifiable, even if mucked cards are mixed in, will not significantly favor any particular player in the long-run and best protects all the players at the table, especially from potential cheating. Splitting the pot in similar situations may indeed be the easiest solution to enforce, but not necessarily the most sound or principled one, in my opinion.