You're making no sense! Look:
@HaxeyeMihawk:
The execution stand isn't in the bay, it's in the town square yet the entire marine force had eyes forward to the bay, so I assume that that's the only entry point
http://www.onemanga.com/One_Piece/550/06-07/
It may not be in the bay, but the execution stand is right in front of the bay. You can see it in this picture, just behind the giants. The quickest way to reach it is through the bay.
, and since the Tarai Current and the GoJ lead into the bay
There's nothing in the manga that says that the GoJ leads into the bay. You made up that information or is confused about it.
it seems to be the only way in, now whether or not Law could just sail from SA and bypass the GoJ idk, because there isn't something that says how close the GoJ is to the island and whether or not it's possible to just sail in between the back of the gates and into the bay.
http://www.onemanga.com/One_Piece/551/12-13/
Here the pirates arrive at Marineford in front of the bay. Are you seeing the Gates of Justice behind them? No.
Indeed, the Gates are so far from Marineford, Sengoku needed to be warned that the gates had opened again in order to know it: http://www.onemanga.com/One_Piece/576/04/
And again there Lafitte's line.
Which just says that others benefited from their scheme. It says nothing beyond that, and no one knew Law was around there at the time.
I don't think the ships on the sides are protecting against anyone making landfall
They were, until WB made the tsunamis. Then the tsunamis were frozen and later destroyed, so the sides are now relatively unprotected.
and they would probably force Law to enter the bay even if there were multiple entry points. And Luffy and the escapees came in on one ship so they would more than likely be counted as one party.
Law came from Sabaody, there's zero reason for him to come from the gates, since the gates only lead to/from Enies Lobby, Impel Down and Marineford. Or are you saying that Law sailed to Enies Lobby, somehow entered the gates there, sailed the Tarai Current and reached Marineford through the gates?
Marineford is very close to Sabaody; Kizaru was able to travel from the HQ to Sabaody in a matter of hours, maybe minutes. Law just did the reverse travel.
And here's, again, the map of the gates and how they work. Read Nyon's words: http://www.onemanga.com/One_Piece/522/10/
Everything I'm saying is supported somewhere in the manga. Please, if you really wanna defend a point, point towards somewhere that supports your point of view. Most of the things you're saying are based only on guessings or wild theories.