No one is denying that he’s serious, but his reasons are unclear and the fact that he’s in SUCH a hurry to get married means the girls should at least verify what’s going on. This kind of thing isn’t normal.
Also, who said she has to take his word for it? In any rishta process where there’s a divorcee involved, people always verify with outside sources too.
You say all this and end with “only if he is a good fella.” This should be emphasized more. The things this guy is saying and asking for don’t make him sound like such a “good fella.”
I agree that the girl’s family’s rule of oldest getting married first is bogus, specially in this case where the older sister isn’t getting married and most likely won’t get married any time soon.