It's definitely not going to be a marriage if Chiru is alive. I am pretty sure he will be proclaimed dead for Kanha to marry Sayuri.
In fact his graph is already changing. For the first time he was distracted during his work. Somewhere deep inside he does feel a bit uneasy about locking her up.
And with the oncoming fiasco he will be even more guilt ridden. Things will probably settle a bit as he will compromise with Chiru's choice, unhappy but would follow it. This all will lead to a marriage. But just before it Chiru will meet his 'end'.... In a situation where he will make sure to bind Kanha in a manner to support Sayuri forever and be her shield.
Funnily enough the supposedly most irresponsible son is going to be Saroj's hardest battle to fight. He is neither soft like Nakul and nor is he hopelessly spineless in front of his Mom like Chiru. He does exactly what he wants uncaring of the consequences. Right now that's a hassle but later this is going to be his biggest power to tackle the challenge called Saroj that will try her best to disrupt his married life. I mean I can see Saroj bringing his ex-GF and settling her in their home 😅