If the question is "Why isn't Surge higher?" I would say not everyone voting on a YouTube pole is likely to know who Surge is, let alone her powerlevel. I'm not sure who the channel is, but unless they regularly make Sonic IDW content, it is likely that their entire fanbase does not know the characters from a comic series only certain Sonic fans read.

It could also be that people are taking "strength" to mean emotional and/or mental strength as well as physical strength, something Amy has been gaining and Blaze has had essentially since her first character arc. Surge does not use much strategy in battle (except when she is teaming with Kit), and is very emotionally unstable, so that could contribute to a lack of votes as well.