Yes, I agree.
1. Guy is member of WBP, actually one of the commanders, Pirate from the New World, for him to not have haki would be stupid.
2. If I remember correctly it was stated that logias without haki die very easy in New World, so how did Ace survived 2 years.
3. He was trained to be next PK, next Pk even after being on WBP ship for 2 years, still didn't have haki?
4. He off set attack from Aokiji, which is from what we know second strongest admiral.
5. During Marineford he was battle worn.
6. True, he was defeated by Akainu, but as I said he was battle worn, Akainu is strongest Admiral, and possible above Admiral level as well, not to mention that Akainu was in advantage because of Magu Magu.
7. ACe has King's haki since he was 10.