No, Tien would more than likely kick the crap out of krillin. Remember during the cell saga when they were fighting cell jr's? Who was getting the worst beating? Krillin? Who is the weakest person out of the people who die the most.... krillin. Um..........whos uh..............short?? ........Krillin! ......... See! My point prooven, short people shouldnt be in ESF............................................................yeah.........................
seriously though, during the 7 years between cell and buu, krillin has been slacking off compared to Tien, whos constantly training.. I dont know about Yamcha....and personally I think hes a little punk, but Tien deserves to be in ESF more than Krillin.
Oh and incase you're wondering, I hate Tien with a passion.