Unfortunately, that is not quite the case. He is simply in the wrong class, which has no reliable way to abuse his effect. Big slow piles of stats tend not to be good from turn 6 and onward. If you have a deck which works, I will listen to you!
Yes, tier 4 probably needs an overhaul too, both of the cards you mention are tier 5 material, but some cards are there because they could possibly have potential in the future.
The biggest issue, however, is that the format has so many cards and there is not enough data. I have played Wild quite a lot myself, but you can play 1000s of games without ever encountering many of the legendaries. At lower ranks, you will rather face pure standard decks than experimental decks featuring rarely used GvG legendaries. The wild part of guide will unfortunately always have an element of gut-feeling.