Sasuke is the sensei of new Team 7, who is the 3rd kid on this team?

[Rikodou Mode]

Well, what should be certain is that it's gonna be a boy. All teams have two males and a single female, so unless the system's changed, the new kid'll be a boy.

Even though it's not confirmed, if we assume Boruto's the dead last type and Sarada's the one that excels in everything, the new kid should be a middle ground. I don't think it's going to be any of the kids you listed, so I'll go with a new character.

I think the roles will be reversed this time though. If Sarada inherited Sakura's large chakra pool and Sasuke's strong chakra then she will have a really tough time controlling it, which could explain her bad eyesight, she'll have to wait until her abilities "bloom".

In Boruto's case he might have inherited Uzumaki chakra with the Hyuuga's chakra control, and he doesn't have Kurama disrupting his development as well.

 

[TimeMask]

I voted for a new character since I think Kishimoto may have a hard time picking one of the new kids to be on the team.

Also if Kishimoto wants Sasuke's new team to be like the old Team 7 then putting one of the new kids in the team wouldn't fit well.

What I mean is that putting in one of the new kids would be like replacing one of the old team 7 members with one of the Konoha 11.

I think the roles will be reversed this time though. If Sarada inherited Sakura's large chakra pool and Sasuke's strong chakra then she will have a really tough time controlling it, which could explain her bad eyesight, she'll have to wait until her abilities "bloom".

In Boruto's case he might have inherited Uzumaki chakra with the Hyuuga's chakra control, and he doesn't have Kurama disrupting his development as well.

Sakura naturally doesn't have a large amount of chakra but Sarada could inherit Sakura's great chakra control and Sasuke's naturally fairly high amount of chakra. Its hard to say how much chakra Sasuke has but he at least has above average chakra.

I could see Sarada eventually learning Sakura forehead seal which would give her a large storage of chakra (if this is what you mean).

 

[KingHashirama]

Whoever is the third kid.. please let him/her be the strongest from the team.

 

[TimeMask]

It would be interesting to see Sasuke travel out of the village with Bolt. I think we should have seen Naruto travelling with Jiriyia for a bit. Kishimoto should show more of the other villages instead of just showing Konoha and rocky landscapes like in the 4th ninja war

Whoever is the third kid.. please let him/her be the strongest from the team.

This would be a good way of motivating Sarada and Bolt to be stronger if their teammate is shown to be stronger then they are.

I don't think Ino's kid will be on the team since he has blonde hair like Bolt and Kishimoto may not want someone else to have Bolt's colour scheme on the team.