this is good to now... that's why it's much harder to relearn something, after you learned it wrong.
In JJ2 and in riding a bike are things what are the same, like that, I wasn't able to ride a big(I mean normal sized bike) when I was 8-10 years old, I had a small bike, totally with the same sizes as a BMX(probably that's why I'm a BMX rider now...), but now, after 5 years, without a bike, I'm easyly riding a big bike,because now I'm doing much more with the small bike than 5 years before...(you are probably asking how this comes to JJ2). This happened the same with the Jazz Jackrabbit 2. I'm wasn't really good in it, but after a few years of not-playing, now I'm much better.