Couple More Rules Clarifications
Q: Do Ability cards that offer bonus based on Gate card G-Power bonuses stack?
A: No, they do not. In your example, if a Gate card had 200 G-Power and the Ability card doubled that you would get 400 G-Power. If your opponent threw down the same card, he would only get 400 G-Power as well since the Ability card boosts Gate card G-Power, not Gate + Ability combined.
I need some help with this one. Are you saying if I had a Pyrus Bakugan and was on a 200 G-power Gate Card Boost and I played an ability card that had a 30 boost for Pyrus Attribute as well as an order below the card instructing if Bakugan was Pyrus to double the Gate Card bonus. My Pyrus should get base 710g+400g Gate(Since Gate doubled from 200g)+30g Attribute= 1140g right ?
It seems like there is no language on the card to say that you do not get the card attribute bonus(i.e.out of 2 on card) plus whatever the card says below ? like doubling gate card power if you are a certain attribute. This makes no sense to me 
Ability card attribute bonus PLUS whatever card says below should apply I would think. Otherwise, why have any attribute bonus's up on top that match attribute below ? And I heard the cards instructions or rules trump the other written rules ?
Other Ability cards give attribute bonus's that stack(I think) with anything else said below on the card right, like Bakugan character bonus ?
Am I wrong on this ? 
P.S. Sorry if this is wrong thread, mods feel free to move it.
Your computation is correct BUT when cards say "double the gate card bonus" it means to double the value indicated on the card and NOT the value that has been changed or modified by other cards. This was to clear up some confusion like if you played an ability card that double the gatecard bonus and your opponent plays the same card. If you have gatecard that gives pyrus 200 and you have an ability card that give gives pyrus 50 and it says you to double the pyrus value then you double the value from the gatecard. 300 (x2) = 600 + 50 = 650. IF YOU opponents plays the same card it will not Double the value from 600 (x2) to 1200. Your opponent will get the same 650 total if he plays a similar card.
Hmm.. I still don't understand your math. I get that my opponent cannot double my doubled value but if the pyrus gatecard is 200 and the ability card gives it additional 50 to pyrus attribute bakugan and it says to "double the pyrus value" then wouldn't it be 400g gatecard(200g pyrus circle attributex2)+100g ability card(50g pyrus circle attributex2) so that would only equal 500g boost right

I guess the card wording would matter as in "double the pyrus value" or "double the gate card value if you are pyrus" or "double the g power boost printed on this (ability) card if you are pyrus" ??
OR
does the ability card itself with its attribute circles add to the gate card value becoming the new "computed gate card value sum total" and that is what would be subject to the double ??