I gave you enough good reasons of why this isn't most likely true, just by seeing Shanks and his crew arriving at Marineford pre-ts you can tell a lot already.
Even if they were comparable, it doesn't mean they are close in strength at all.
Especially after seeing King, i wouldn't put that much expectations on this headcanon where Right Hands are close in strength to their Captains.
They might be comparable on some aspects, but close in strength? Naah
Im up to be proven wrong tho, Oda will have to show to the readers that this statement talks about strength
Even if they were comparable, it doesn't mean they are close in strength at all.
Especially after seeing King, i wouldn't put that much expectations on this headcanon where Right Hands are close in strength to their Captains.
They might be comparable on some aspects, but close in strength? Naah
Im up to be proven wrong tho, Oda will have to show to the readers that this statement talks about strength
VC straight says combat power.
Not his ability to play fucking poker or something