UK Infinite Leave to enter(ILE) & Visa

Apart from marriage certificate. Is this details are fine to show the subsisting relationship:

1)Evidence both have met each other in 31 photos,Flight itinerary travel dates in Excel sheet print out
2)Communication history starting from January 2012 till present around 40 pages but no phone calls record.
3) Bank letter confirmation of having Joint account (applicant and sponsor) from Bank: this bank letter crossed 28 days rule.

In case of Accommodation: 3 bedroom flat with 4 occupants(in future including applicant it will become 5)
Condition:
Landlord/Owner is British citizen(no relation to sponsor)
Tenant is sponsor's brother in law(British citizen)
Sub tenant is Sponsor(monthly rental of one bedroom only)

Query:
Is it allow to show the documents as being sub tenant,if yes then what sort of accommodation documents needed as per above criteria for UK spouse visa?