I had a job offer from a university in UK and granted a Tier 2 visa on 25th September 2018.
My husband's visa was refused

For a probable second visa application, The documents that we can provide are:
the deed of a house we have bought together about 8 months ago, the mortgage and its payments for the last 8 month. Some pictures from the past 7 years.
Are these sufficient for getting a positive result? are the number of people receiving positive responses after the first refusal considerable?
The other point is, in my COS the university had given maintenance for my husband so we did not provide any financial documents and this was great since we did not have that much amount of money, can we still use that COS (before expiration) and use the maintenance option for the second application?
I mean now with my visa being granted, is the maintenance still valid?
any helps are highly appreciated