no, only counts as 5
Correct. The only time you can win with 6 LSs in T1 is if you win 6-5 (if the score is 4-3 with your opponent in the lead and you play SoG on two 2-liners, one of which you had half rescued and the other your opponent had half rescued, or other crazy situations involving 2/3-Liners). If you would get 6 LSs in a normal game, it is only counted as 5.