Hahahaha ... I had thought that too but then I realized someone other than the Dolphins would have figured that out by now.
Although what I wrote is over the top, Dolphins don't have a lot of options, odds are the guys on practice squads are better and in better condition than a player that was cut and hasn't been at a team practice since August. There are less than 200 PS players across all the positions and mismanaged teams are more likely to have a diamond in the rough than one where the coach obsesses over the bottom of the roster.
Dolphins o-line is a mess and this signing won't fix that, but I reject the idea that signing a player off the practice squad of the pats or eagles is a better move than signing on off of browns or giants.