Ah, an upgrade of an old favorite of mine. Marvel Entertainment (NYSE: MVL). I've owned this one in the past. Never lost money on it. I'd like to be back in Marvel. Only one problem.

Yesterday, Marvel, a company whose comic library competes with Time Warner (NYSE: TWX) and its own stable of superheroes, received an upgrade from JPMorgan. It now is in the Overweight camp. Before, it was merely Neutral. As you might expect, the stock reacted. There was no way the market was going to ignore this because, really, Marvel is one of those stocks that does show a lot of promise considering that the sequel to Iron Man is due out next summer. Shares closed over 5% higher on Wednesday in reaction to the headline. The professional traders must loved the action.

Yesterday, I wrote about my nervousness over Marvel's (NYSE: MVL) The Incredible Hulk. Today, I'd like to talk about how I wouldn't be so nervous if the Iron Man sequel ended up being directed by someone other than Jon Favreau. There are two excellent articles on The Motley Fool discussing this issue, one by Nathan Alderman and one by Marvel expert Tim Beyers. At the time those articles were published earlier in the week, it had seemed that Marvel was reticent about ponying up a higher compensation package for Mr. Favreau on the heels of the awesome success of the first movie starring Robert Downey, Jr. David Maisel, chairman of Marvel Studios, apparently wants to be very conservative about the company's above-the-line costs. Alderman thinks Marvel should give Favreau the requested raise, while Beyers understands the Hollywood dynamics going on and can see why both sides are doing what they are doing.

By the time my own piece is published, it's possible Favreau may be confirmed as the director of the second Iron Man (as I write this, there are rumors that a deal has been offered). Regardless of what happens, I'd like to offer my opinion on whether or not Favreau is an absolutely necessary component for an Iron Man sequel.

He isn't. And if shareholders think he is, then they had better rethink their investment in Marvel. What shareholders must ask themselves is this: Is it the director that is responsible for the ultimate success of a Marvel film, or is it Marvel management and the intangible value of the Marvel intellectual-property portfolio? Which element adds more equity? As far as I'm concerned as a shareholder, I'm investing in Marvel. I'm not investing in Jon Favreau. Any investor who believes that any one director is indispensable is going to be in for a stomach-churning ride, because when the day comes that a Jon Favreau or a Sam Raimi (he directed the Spider-Man flicks) decides that Marvel is no longer paying them what they're worth and jumps ship, the stock could easily see an overreaction sell-off.