or this is how it could have happened:

oh my god wait what if:

saito has been trying to get eames to do this inception on fischer for like 6 months, and eames keeps saying no because he’s not really into the whole will-altering business,

so saito sends people undercover to find out what eames’ ultimate weakness is, and how he can use it; and it’s THIS DUDE NAMED ARTHUR WHO’S WEIRDLY SHACKLED TO THIS INCOMPETENT MORON NAMED COBB WHO KILLED HIS WIFE AND IS ON THE RUN FROM THE US GOV’T, and the only way eames will do inception is if arthur is doing inception, and the only way arthur will do inception is if cobb will do inception, and Saito is like, SIGH, THE THINGS I DO FOR EXCELLENCE

so he sets up a bogus job with cobol engineering to convince cobb to “run” the inception job, all so that eames will finally say yes

and that’s why saito just magically happens to already be in mombasa, because he’s keeping an eye on his investments ie EAMES

and that’s why eames is just magically able to whip up the whole inception schemata, because he’s been planning this whole job for months already by himself