A couple things about the 2016 V6 Accord-
The weight distribution is 62/38. It's going to understeer like a pig with front spring rates higher than the rear spring rates (as opposed to the opposite with the twins). Even though the Honda has stiffer springs, they are not stiffer by much considering the extra 800 lb that the Honda carries. It'll ride much softer. The Accord also has smaller swaybars than the twins adding to the general porky nature of turning that thing into a corner.
The Accord rides with a higher COG. More weight, higher on relatively softer springs will create a very floaty and roly poly driving experience. Sports cars tend to either have a lot of power (think muscle car) or very tight cornering (think.... ugh... well, the twins!)
FWD vs RWD
According to stats I read the Accord does do 0-60 a tick faster, 1/4 mile the Accord is a little faster too. Braking- the twins do it much better. The twins pull a lot more lateral g's.
I'd love to see these 2 cars on a track head to head and see some lap times.
There's a lot more to making a sports car than the way that the car looks and the power figures. Is the Accord a sports car? I'll believe it when I see one do something other than get the groceries (even if it does that quickly). I'm not saying it is not, but on paper it doesn't look that way.
Also, there are no Accord racing series that I know about. The twins are part of the PWS, VLN and
have their own racing series along with several others. The twins are in several video games. I think our culture has determined that the Accord (V6 or I4) is not a sports car. I'd have to drive one to make up my own mind though.