Lol wtf? I was under the impression that his strength was A+, I mean it would make sense since Kojiro has A+ agility for a mid tier spirit without any form of mad enhancement and Hercules is practically the strongest heroic spirit I can think of. I also didn't think Mad Enhancement was factored in when shown on the VN stat sheets, or else Cu Chulainn would basically have the same strength as Hercules then. Rin Saber's stat sheet in the VN also had her base strength clearly at A. I also thought prana burst was an activated personal skill and wasn't shown on the stat sheets, which is why her stat sheets for both Shirou and Rin had the same rank for Prana burst but different stats. 
I'm so confused lol.
I'm gonna go ahead and take Archer then.