Here's my question though, is it worth it to go after him in court?

Before he died we filed a transfer upon death deed and were told upon his death I would simply go to the court house and the transfer would be completed.

If you ever find yourself in court the burden of proof will be on you to show that each entity operates independently.

They have put in a pay or quit notice to the court which is scheduled for 15th this month.I have asked him to release me from the lease so I can take care of the property myself.

Exclusive jurisdiction for any litigation arising out of this agreement or its subject matter shall only be any federal or state court in the State of Florida, to whose jurisdiction the parties hereby subject themselves.

if they don't follow through with what they said they would then I immediately move forward with an eviction and since I have already delivered the 3 day notice I can call my eviction attorney that day.Nothing helps a tenant find the rent money like a legal notice to attend court.

I would then begin the court process since the tenant is not paying their rent on time.

In the court dockets, it shows that the attorneys hired a private investigator to locate the woman (original lien holder) and they could not find her, in fact, there was very little information showing that the woman even exists (aside from a few addresses and other minor info). 

IE small claims court if you really want to pursue this.. you just whining about it wont get it done.. you need a judge to decide who pay

If you're concerned with looking good in court, that's pretty simple.