Nah, it's just that I think Napoli's the closest guy to the point where you get all the things Boston needs out of their corner infield/catcher/slugging RHH trade target. Not that he's so great, but more that he fits so many different separate needs in ONE guy, which when you start doing roster math is pretty important.
With the departure of Beltre, we'll be short on RHH power. Righthanded power is one of Napoli's better positive attributes.
We will be looking for EITHER a catcher OR a first baseman OR a third baseman, presming we sign V-Mart. Napoli can't help us at third, but Youkilis can, and Napoli can play either of the other two positions.
We need a guy whose team might actually part with him for a reasonable ROI. I've covered upthread why I think Napoli is one of the better candidates for that. Parting with a Fielder or Gonzalez is a major franchise decision and takes a bigger price by definition. Parting with a guy who you already have 2 players who can cover his positions and whose skillset is at odds with your team philosophy... well, you'll still want a fair price, but you won't force people to overpay.
Defense is one of the bigger issues with such a proposed trade, of course, and that is a weakness, but frankly we're going to lose something of our infield defense on the corners no matter what we do -- Adrian Beltre will almost certainly not be in a Sox uniform this time next year. Since I can't think of a single really decent FA third baseman other than Beltre (which is a big factor in why I think he's gone), it's going to be Youks at third next year and we bless his versatility for giving us that option. Just shore up the MI defense as much as you can and get a good backup for the 9th and call it good.