1. Are two handed bowling style develop from young, when the bowlers unable to bowl with heavy balls. Over the time, this becomes a form of habit. In the end, it turns out to become a bowling style?
First of all, you are talking about the Belmo and Osku style of thumbless two-handed bowling what I affectionately call the Kamehameha Style. Technically, no bowler is one-handed unless he or she uses only one hand for the entire approach. Now on to the question.
I don't know really. When you're young is the best time to learn and teach the body things. As it becomes familiar and recorded into muscle memory you well get better and better. It really doesn't matter as long as you gain experience and practice with an open mind. As for a habit, DUH! That's what practice is, Belmo-style, spinner style, palm bowling, or more traditional style. That's is the point of practice; to get the muscles to act in habitual ways. We just like big fancy titles like muscle memory.
As for two-handed bowlers being young and not being able to bowl with heavy balls. That's how Belmonte developed his game. It would certainly polarize the viewpoint that way However, last year or the year before, WJW Jr. was bowling two-handed to get more side rotation on his balls and get a better reaction, in his 50s mind you. Personally, I think more people are developing it for the power in allots them in terms of carry as well as, generating a potentially better entry angle.
2. The so called mistakes in bowling. Spinner shots & etc. In the end, we try to study/understand & perfect it. It becomes something useful, respected & new technique?[/b]
I don't really get what you mean. If that's your style of play then yes, and others be damned. As long as you understand the style as a whole and know it's pros and cons, can perform it consistently and make adjustments I say yeah. Here's an example for you, I know a bowler who averages anywhere better 190-210(usually closer to 210), but he chicken wings every single shot. That may be something for somebody to look at, study and maybe even adopt into their game. But in my game it serves no purpose, a chicken wing for my preferred style of play
is a pulled shot or 3 count. So I exclude that technique from my game but acknowledge that that bowler has something good going on for him
As for the Spinner, Palm bowler, etc. those styles have their advantages, but I know my capabilities and body as well. So I adopt the style or multiple techniques to me. I don't include them in my game save for the occasional time I want to roll the ball like Belmo or Osku. Biomechanically, my body feels the most at ease and best using a traditional style approach, free swing, and strong release...with some tweaks. My wrist can't handle the strain of the spinner style or a palm bowling style. And for the Belmo-style, my lower back gets strained if I'm off in the slightest. So I don't practice them. My point is that it is a person to person thing really.
In terms of respect, I don't know where to go with that one. I think there will be a bit more discrimination against those that don't use the traditional methods. Mostly because that's how the sport developed and that is how a majority of the coaches are and do teach. However, if you score well, who really cares how you do. 10 in the pit is an X in every (ten pin)bowling alley. Besides, if you go out of your way to get respect, you're an approval junkie. And regardless of who you are or how you bowl, you'll get smashed into the ground. I don't think Belmonte or Osku really went out of their way to say, "Hey! Hey! Look at what I can do." (Maybe they did IDK) They bowled their way and let everybody else be damned.