Not necessarily to lose against passive middle anyway, no matter the board. It seems you don’t understand what I’m saying. Actually with Guin, Aegir, Ares, etc, so passive heroes, the battle could take a little longer. I usually don’t lose with these tanks. But if the battle take you long enough and you terminate the centre too late, then GO will do which no other hero does in the game.
Of course, in such a case, you could go first for him, but letting alive too long a center with mentioned tanks, is suicidal.
Besides, between a slow hero and a very slow hero on the wing the difference is insignificant. Why Alby or MN are considered such great heroes and GO not? The yellow bird is more lethal. The greens rarely resurrect more than 1 (or nothing). But GO will hit you hard. I would ascend him, if I were you. At least at rush attacks tournaments, you will have grade A
Oh, and you may shine in AW in the second half also…