Sounds more like a fan fic idea then a show plot point Medi

. But don't take the "weakling" comments to heart, because in a way that is a pretty shallow statement. Every villain at some point becomes weak. Look at Frieza, he was virtually indestructible and the most powerful villain of all time, now he's considered weak.
The Androids surpassed him, and Cell surpassed the Androids, and Majin Buu surpassed Cell and so on and so forth. Every villain at some point becomes weak because the Z fighters train themselves hard enough to be stronger to face each new foe, thus, what was once the strongest villain ever becomes second rate.
It's just a natural progress of power levels and its not limited to just Raditz. I loved "Fusion reborn" seeing all the villains escape from Hell, and Gogeta battling it out with that uber bad ass bad guy Janemba. But my favorite movie, number one for sure is the 2nd DBZ movie "The World's Strongest".
Like you said about Dead Zone, I loved the music in world's strongest. Plus the villains were so unique in this movie, even more so then the usual ones. Those bio-fighters had such outrageously weird powers and Dr. Wheelo was such a weird bad guy to fight, a giant brain in a souped robot suit.