darn, speiderman beat me to it, but I'll try and impress TO by talking some more

, and yeah, been asked before
You saw AOTC? There is this scene were OB1 goes visiting Yoda who's training the younglings. ("Younglings! Younglings! A visitor we have!" with them responding "Hello master Obi-Wan."

. That is to clearly show that Yoda trains ALL the younglings BEFORE they become padawans. When they become padawans, they get a jedi master (master here is not a rank, mind you, it's master as in "he has an apprentice"

. For OB1 this means that he as a youngling received training from Yoda (see the ESB quote you gave), BUT he also received instructing (not training, since the actually training is already finished when you get the rank of padawan) from Qui-Gon Jinn (see the entire movie TPM for that).