Honestly, why are people acting like Sai getting married to Baby 5 is a good thing? Sai just looks ridiculously stupid and gross in his resolution in this chapter, which is disappointing as I enjoyed his character during the Corrida Colosseum battles.
As we have seen with Baby 5's interactions with the Donquixote Family, it is clear that Baby 5 cares about them and they care about her in return. This is even seen in this chapter, as Baby 5 calls to Lao G's 'spirit' to come back (which was hilarious). Doflamingo even goes out of his way to protect her from being married off, burning lecherous suitors' towns to the ground. The Donquixote Family gave her a home, the closest thing to a real family like she used to have, and its absolutely ridiculous how many people are reacting positively to the prospect of Baby 5 getting married to Sai. Sai only accepted a proposal to due to misunderstandings deriving from Baby 5's wanting to feel 'needed,' and claimed Baby 5 as a a sort of prize to be won by saying he will marry her after winning his battle. If she were to marry him, Baby 5 would still have the same 'I'm needed!' quirk and would not be faithful, and probably not what Sai or any of Baby 5's previous suitors would want. Even Lao G explained to Sai why Baby 5 acted like she did!
Honestly, it's ridiculous how much this fanbase tends to forget Buffalo! Him and Baby 5 have been friends for at least 16 years and have been shown to be very close, in both the present story-line (Punk Hazard, Dressrosa and Law's flashback). I highly doubt that Buffalo would be fine with Baby 5's proposed marriage to a random guy she just met, he would lose his partner and his closest friend. Hopefully he recovers from his fall from what feels like 100 chapters ago and defeats Sai, but one can only dream, right? This entire event would not have happened if Buffalo wasn't KOed, Baby 5 and Buffalo are always partnered together for a reason.
I would be great if Oda brought back Giolla as well, as she also has not gotten a proper battle (ending with an officer being 'eliminated'), and has not been seen in the current story for at least a year! Her ability is really fun to see in the manga as it is visually unique, and strong as well. Oda is a cruel man for giving so many great characters so little screen-time in this arc; I would much rather see them fight than the Colosseum fighters as most of them are pretty boring, in my opinion of course.