Hey riot, what about sion?

Let's compare god tier tank(ornn) with shit tier tank(sion). Look at base stats. https://prnt.sc/r4r48i https://prnt.sc/r4r5bo 590 (+95 per lvl) HP vs 540 (+73 per lvl) HP 36(+4 per lvl) armor vs 32(+3 per lvl) armor I mean 420 HP difference at lvl 18 is a little bit too much. You will say "but sion has his W bonus health" YES but ornn has the same too and sion must last hit atleast 100 minions just for these 420 HP, and only after i start to stack more. But.. ornn has bonus 650 HP from items and giga tons of def stats. So only after taking 250 cs sion has same HP as ornn.

Next one, why sion has 21 less armor at lvl 18 than ornn? because oh his insane shield? So as ornn i have 420 HP and 21 armor more than sion which will cost ... 1500 gold. Just for base stats. Why? Not even talking about broken ornn's mechanics, just comparing base stats. I can stack around 1000-1200 HP in game so my HP gain from lvl is small, but why ornn has no penalty for his bonus HP and def stats...