This doesnt mean you cant exploit them further
It also means that while Henzie can cheat out Blightsteel Colossus a turn or two early (if it chose to play it, which it wouldnt, because of the shuffle but stick with me), Tannuk can get it out as early as Turn 4 with Haste (or even earlier with Sol Ring and Rituals)
Even just staying in mono-white, you would have access to Enlightened Tutor, Idyllic Tutor and Moon-Blessed Cleric, which can all search it up in the early game
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You see, he's Gruul, therefore he is the superior choice