Just like anything that requires talent, you get a lot of people showing up willing to throw everything they have at it and still end up in the middle somewhere. I can only speak from my experience in TA/FC, but I can tell you there are more people throwing money at it than the winner's circle indicates. And I think the same can be said for pro stock. I bet Greg Anderson could jump in any number of cars and run quicker than the guy that got out of it.
For example, I had (I think) a total of 9 different drivers including me in my car. It was a 5.60-5.70 car. And without making any real significant changes, a guy named Marc White gets in it and run mid 5.50's the second time we take it out. That was 13 years ago (2004 Winternationals). He proceeded to run 5.50's at 3 out of the 5 national events we ran that year, and the fourth event he ran a 5.600. Then I put other people in it and it's back to 5.60's and 5.70's even after upgrading to better stuff. In 2008 I put Daniel Oliver in it for just 8 National Events and it's back on top running 5.50's, we win two of the eight national events he entered, runner upped the third and qualified number one with him at Las Vegas, April 2010, where the tech officials came over and did a cavity search on my car after someone accused us of cheating. Then I put guy number 10 in my car and it's back to 5.60's and 5.70's. First round the last time out with him he was on a solid 5.50's run and he thought the 1,000' cone was the finish line so he shut it off, losing with a 5.64 at 240. Then they look at me likes it's my fault he never ran 5.50's. I had one guy upset at me, claiming I detuned the car for him. I took him in the trailer and spilled the beans on the tune up, and I showed him the Racepak screen on the computer comparing him by overlaying his runs with Marc White's runs. Marc was like a computer hitting the shift points, launch RPM and foot swap timing (which equals wheel speed), etc., compared to his short shifts and erratic launch RPMs.
All that to say, the slower pro stock cars with owner's leasing million dollar engines who think the engine supplier is screwing them need to look deeper into their program. Probably the same thing for the guys who buy engines from V&H in PSB. I remember one of Brad Anderson's employees coming into my trailer after Marc ripped off his second mid 5.50 in a row at the 2004 Winternationals. He said "You're still running that old set of Brad 5 heads with the 16 spark plug holes and the pushrod tubes sticking into the intake ports, aren't you." I didn't have the latest Brad 6 stuff that fixed all that. I said "Yep, and I even have steel plugs screwed in the extra eight spark plug holes." He said "That's what I told Brad. Brad has guys accusing him of not selling them the same stuff Manzo has. Now he's telling them to go look at your car. You have the older stuff on it and Marc is killing them." Marc ran a 5.56 followed by a 5.55 and was .02 quicker to 1,000' the next round when it broke a main fuel line fitting and blew up the next round at Pomona in 2,100 feet of air. This was when Manzo had the national record at 5.53 at Reading in mine shaft conditions with probably 100' corrected altitude.
Yea, I'm scratching Marc White's back. But like I said, at least in TA/FC, it's been my own experience that there are only a few that can actually drive them. The rest go for rides in them. Frank Manzo could have jumped in about anyone's fairly good running middle of the pack car and within a few runs made a winner out of it. I'd say that's true in pro stock, or any class for that matter. And just so it's easier to understand, I got out of mine in 1996 because I knew I was just going for rides in my TA/FC. If I wanted to win, I needed a driver that weighed 100 pounds less than I do and wasn't driving with their brain attached to their wallet that was mentally planted between the gas pedal and their foot like mine was. I wanted to win worse than I wanted to go for any more funny car "rides." It's too much work.
Here's a perfect example. A guy walks into a WalMart, goes to the toy department, picks up a $19 plastic NASCAR guitar, and starts playing a Stevie Ray Vaughan hit. Just like golf, it isn't the clubs that keep you down.