So, if Terra's heart was inside the Guardian and in KH2 whenRiku accepts his darkness he uses the Guardian to subdue Roxas, does that mean that Riku had control of Terra at the time?

yes

4 minutes ago, ocean's rage said:

yes

and how come Riku didnt help Terra the way Sora helped Ventus?

55 minutes ago, yamibakura said:

and how come Riku didnt help Terra the way Sora helped Ventus?

he didnt know where terra was. nobody knew until the reveal

21 minutes ago, ocean's rage said:

he didnt know where terra was. nobody knew until the reveal

but didnt Ansem SOD know though?

12 minutes ago, yamibakura said:

but didnt Ansem SOD know though?

yes. but that doesnt mean riku would know

16 minutes ago, ocean's rage said:

yes. but that doesnt mean riku would know

so basically Riku was able to control the Guardian but he had no clue terra was in it? isnt the guardina a symbiote?

12 hours ago, yamibakura said:

so basically Riku was able to control the Guardian but he had no clue terra was in it? isnt the guardina a symbiote?

no