Check these guys out.
http://en.wikipedia.org/wiki/Sigismund_III_Vasa
http://en.wikipedia.org/wiki/Władysław_IV_Vasa
So WI Sigismund isn't deposed say he learns of his uncle's treachery and deals with him. Then suppose he assists his son in claiming the throne of Moscovy does this ultimately strengthen the Commonwealth or lead to a faster decline?
http://en.wikipedia.org/wiki/Sigismund_III_Vasa
http://en.wikipedia.org/wiki/Władysław_IV_Vasa
So WI Sigismund isn't deposed say he learns of his uncle's treachery and deals with him. Then suppose he assists his son in claiming the throne of Moscovy does this ultimately strengthen the Commonwealth or lead to a faster decline?