Sabo is being set up as a top 5 EOS type of character, at the least on the level of the Yonkou, likely even above. Is Akainu so strong to you that you're celebrating him fighting someone who will likely be above Shanks at his peak, as some sort of major loss?
Ace was PK level potential btw, Sabo inherited his will like you said.
It wasn't about how Blackbeard or Akainu felt about Ace. It's about how Ace felt about them since Sabo inherited Ace's will & not theirs. How Blackbeard wanted Ace or how Akainu wanted to kill Ace does not matter in the slightest because Sabo is not inheriting their wills lol.
And Ace undoubtedly hated Teach more than Akainu.
So yes, the argument that Erkan used is stupid, as usual.