If Greig could play a full season against men at 19 y/o, that'd be great. Plus go to the WJC that he unfortunately missed last year. That 19 y/o season would be very similar to what Stutzle did in the NHL last season, but a level below. I believe Greig is a pretty good prospect himself and could be up to the task.
But of course if the kid is not ready mentally and physically, then he goes back to junior. I assume Troy Mann knows what he is talking about and knows what Ridly Greig is made of.
Yes, they did kick off a re-build 3 months later, and you can say that it was evidence that PD misjudged the strength of his team and should have realized that the previous years cup run was catching lightning in a bottle. However, I don't think you can say that on the day the trade happened PD had the intention of blowing it all up 3 months later, the team sucked after the trade and I think it became evident that they wouldn't be competitive. The horse was already out of the barn.
The team from the cup run was not bad at all, we could have continued to improve it (financially healthy teams would have done that) but there was problems the following year :
Marc Methot and Clarke MacArthur : never replaced
Bobby Ryan, Dion Phaneuf and Craig Anderson : declines due to age/injuries : never replaced
Karlsson surgery : nobody to take pressure off him
That's 5 big holes declining fast or not replaced adequatly. Plus teams adjusting and figuring out how to play against Boucher's Sens. Oh and the Hoffman vs Karlsson fiasco to complicate things even more. Room was probably divided, they weren't following Boucher anymore and the ship sank. As we can see with the Habs current run, most NHL teams are capable of doing good or bad, it depends on a lot of factors and sometimes it doesn't even take that much to change a team's momentum.
But the idea of upgrading Turris to Duchene was great but it was another half assed job. They had to be certain other "factors" on the team wouldn't backfire. Kinda gambled "everything will stay the same and go well" and lost.