Positions vs Stats vs CA

Ok i have more questions that i can't answer myself

1. CA=100 PA=200 Determination=20 which player will develop better (CA)
a) Single Position (like Center Forward or Center Defender)
b) Multi Purpose (like all position defender or all position supporter)

What i mean after same amount of time spend on the grass which one would have a better stats after while?

2.Value of player (Fame 10000)
I still don't get it how game is calculating a value of players
which one should be more expensive the multi purpose or just single minded one if both have same CA/PA?

3. Which player style is overall better for team in your opinion? Single position guy or a man who runs from end to end, from left to the right of the field ?

Things like CA and PA are intended to be hidden, and too many questions are raised and too much confusion is caused by getting to know them through third-party tools. Besides, there is no single, correct answer for each of your questions as they depend on a multitude of other possibilities.

Consider your favourite teams. Who is the more important? Is it the old, reliable stalwart who may not be the best player but is capable of playing everywhere with little reduction in quality, or is it the star mercurial forward? Both are important, no?

Thanks for answer but it's still not clear to me which one of player style is overall better
From one point of view single position star could be amazing (like right side defender) but at same time not many clubs today have this kind of solution in their squads
From the other side i got one Wonderteen who is trained from sweeper to offensive midfielder - his physical stats are insanely good but from technical aspect he is just mediocre at most not to mention his ability to marking, tackling and heading are 9/11/12 ... his value at this moment is calculated by game for 53KK euro ... without playing single game in main squad -age 18.