What breed is ace??

Newbie here but wanted to get some opinions on what breed they think ace might be, I rescued him they said he was the runt and his parents are Staffordshire pits, I can’t really tell. All help is appreciated, he’s really small like can fit in the palm of your hand small they said he was 8 weeks (which I doubt) he is playful and overall seems somewhat healthy. So with that being said can someone just take a guess of what he might be? Thanks in advance!