Lor’themar theron breaks this tavern brawl and sets the stats of the 1/1 cards to their original stats and +1/+1
You got it the wrong way
Cards that have not entered your hand yet are still at their base stats. Theron will double their stats. Once they enter the board or your hand , their base stats will be set to 1/1
So they don’t end up at base stats +1/+1 buff, they end up at 1/1 +base stats
There’s little chance they’re willing to change this behavior since it’s long known and they only fix brawls that are unplayable (which this one isn’t)
still, seems a lil bit crazy that they end up that way instead of just plain 2/2 
seems unintentional but if it’s been like that i guess i shouldnt complain