Ballistamon's Rancor [Rationalization Phase]

[Grandwing]

Ballistamon, A heavyweight Digimon that has armor of a thick metallic quality and overwhelming power is acting peculiar. Ballistamon has these parameters in its back compartment which lacks a number. This might be causing it's rather odd behavior.
Can you answer the unknown number?

Rules:
1. Each tamer can only answer the ? in this game 1 time per day (from the time you posted.) You can try guessing the answers for the other word association games too if you have already placed your guess/answer for the day here.
2. As long as I haven't concluded that somebody has won this contest already then you are still free to place your guesses.
3. Please follow this format in placing your answer:

?= [Your answer]

4. No chatting please, we have a different thread for chatting.
5. You win the digimon if you have correctly answered the unknown number.

 

[lief_7]

?= [5]  

[wild wulfie of the forest]

?= [3]  

[Kizadek]

?= [1]  

[KiroMishima]

?=[8]  

[ultimatemk]

?= [0]  

[Grandwing]

Zadoc the 27th

?= [1]

yes it is 1.
Rationalization phase now open.

Please explain in exact all the relationships of the numbers in the red, blue and yellow boxes in order to win 10k gold.  

[SU Blue]

Rationalization:
In the red boxes the numbers are multiplied together to get the numbers in the yellow box as if they are aligned in place ten formation. The numbers in the yellow box are multiplied together to get the single number in the blue box.
Set 1: 5*4*3*9=540(yellow box); 5*4*0=0(blue box)
Set 2: 2*8*6*4=384(yellow box); 3*8*4=96(blue box)
Set 3: 7*4*9*?(1)=252(yellow box); 2*5*2=20(blue box)  

[Grandwing]

SU Blue

Rationalization:
In the red boxes the numbers are multiplied together to get the numbers in the yellow box as if they are aligned in place ten formation. The numbers in the yellow box are multiplied together to get the single number in the blue box.
Set 1: 5*4*3*9=540(yellow box); 5*4*0=0(blue box)
Set 2: 2*8*6*4=384(yellow box); 3*8*4=96(blue box)
Set 3: 7*4*9*?(1)=252(yellow box); 2*5*2=20(blue box)

exactly!
please wait for your prize gold.