Why was Law on Pokémon First Gen Rock Tunnel?
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You have some misleading believes towards haki.
Haki isn't literally ambition. Luffy aims for Pirate King since as kid. He didn't even had haki back then and once he learned his haki was weak. So having a strong ambition doesn't make you strong. Ace had everything to be next Roger for example. Or even next WB.
Truth is that DF gives you an advantage on most situations. Oda barely exploit DF disadvantages that is to drown underwater.
But Oda nerfs DF users to be matched by haki only users. For example, narratively Zoans were suppose to be the top class of DF and fighters. They are perfectly able to be as strong as a haki user but they have the enhancement of their Zoan DF.
Not surprisingly Kaido was WSC.