Rabbi Yochanan said that you cannot dedicate anything that is not in your possession, as,  someone stole it. If Rabbi Yochanan holds like all unattributed Mishnas, this statement contradicts a Mishna in Maaser Sheni 5:1, where one can redeem fruits that were stolen from him/her after they are no longer in their possession. After a long attempt to change the version in the Mishna to conform to Rabbi Yochanan (that the redemption of the fruits happens before it was stolen), this possibility is rejected because of another opinion of  Rabbi Yochanan that contradicts this as well (there is no retroactive designation). To resolve the issue, they explain that Rabbi Yochanan holds by a different unattributed Mishna (our Mishna). What motivated him to rule like our Mishna and not the Mishna in the Maaser Sheni? In the discussion with Rabbi Yochanan regarding the Mishna in Masser Sheni, the Gemara brought a different statement of Rabbi Yochanan that Rabbi Dosa and the modest ones (tznuim) said the same thing. Three amoraim that if Rabbi Yohanan had not said this sentence, we would have come to different conclusions on several matters. What are these conclusions?