I've ranted enough about it on the irc chanel that I won't waste your time (too much-- try to keep it brief). Long story short, actually TAKING caeser and GOING to green bit is just such a stupid, risky plan. He called the shots (he has the hostage; remember, w/o Caesar DQ is fucked-- since Kaido is the ONLY one he fears)-- he could have picked any number of meeting places. He could have left caeser some where. He could have told DQ a time way advance in the future, or just say "I'll be giving you a call soon" and leave it at that-- keep the man next to his phone while you scour the area and look for/destroy the factory. Fuck, even the current plan would be exponentially better just by leaving tie/gag Caeser out in the open (you have his heart-- you can kill him at any time), and WAITING HIDDEN in a BUSH for DQ to come to the meeting spot. Law doesn't even NEED rope-- just cut Caeser up into sections so that he can't put himself back together (while gagged of course).
Law is potentially the KING of espionage-- if he wanted to make himself eve more safe, he could cut out one of his eyes and leave it in a hidden location while waiting even farther away.
Even without that point-- how about just LYING to Fujitora about the relationship with the straw hats-- wtf is there to be gained by being an honest dumb ass. Law is not Luffy-- I have no idea what Oda's writing in regards to Law.
The point is that without even going into detail or thinking too hard, there are an endless number of ways to accomplish just about any goal you could think of that are not so stupid. Hell, I bet Zoro could come up with a better plan than this.