My question involves landlord-tenant law in the State of: Maryland

Hello, I share a joint lease with two other individuals. The lease expires in July, and I am planning to leave at the end of the lease term and not renew. I will be giving 90+ days of advanced written move-out notice (lease only requires 60 days). My rental company has explained that if the two remaining residents wish to stay (which they do), they will need to reapply and go through the income verification process (sure, no problem). Then, once their income is checked, they must sign a 'roommate addendum' in order to legally remove my name from the lease. I am questioning the need for this form, which essentially requires my roommates to give me permission to exit the lease, despite the fact that I am giving sufficient advanced notice, clearly indicating that I am choosing not to renew, and moving out at the end of the lease term. Why are their signatures required? Hypothetically, what if they refuse to sign and plan to stay there indefinitely? Would I really be stuck having to stay on the lease?

Additionally, my rental company designed their own move out form to provide written notice. The form states 'notice from one is notice from all' and 'any tenants wishing to remain in the dwelling must sign a new lease.' This makes sense to me - the process described by the form seems to fully terminate the existing lease, and then to draw up a brand new lease agreement that would presumably begin the day after the old lease expires. But by requiring the roommate signatures, the rental company seems to be using the process for a roommate switch in the middle of a lease term and not considering this is the end of the lease term. They have explained that in their lease management system, this is the way it works, but I still challenge the need for the roommate signatures. Am I right or wrong?

As an additional minor issue, I would like to try and get my security deposit back - but since the rental company views this situation as a continuous lease with renewal (instead of a clean break by closing out the old lease and drawing up a new one), the security deposit must stay with the lease.

Thanks so much for your help!
-Matt