Consider getting a statement signed by all parties which states that everyone has agreed to terminate the current lease early on X date and all obligations by all parties have been paid in full and that the deposit will be kept by the landlord and will be applied to the new lease. 

It depends on a lot of factors; primarily the local jurisdiction rules that may limit lease changes (in Portland/Oregon rent, security deposit, screening fees, an no-cause evictions are heavily regulated).

My involvement in this dispute of deposit money began and ended in those screenshots I supplied.

I am subletting a property that I am planning on purchasing the set up where instead of any type of security deposit I am re-having the property which is necessary before I rent it out.I will have about $20,000 in expenses all before I purchased the property.

Additionally, have a clear budget, factoring in potential repair costs, and ensure you understand the rules about earnest money deposits and closing deadlines.LLC for Real Estate Investing: Forming an LLC for rental properties can offer liability protection and may provide tax advantages, though the tax benefits are non-existence for rentals.

Consider all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.

Would you take an escrow account with a deposit?

What do you do to ensure that the tenant is responsible for security deposit disputes since that is the largest reason for owner lawsuitsHow familiar are you with the newly changed laws that can affect you the owner if they are not used correctly?.

Consider all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.

After searching more, I found a few BP post where people seemed to have one account for all deposits, and keep only deposits in there.