I was just thinking, as we all know Ace is currently hunting down Blackbeard for killing a nakama. However even tho looking too deep into things isn't something which you should always do I don't think we look into this certain topic ENOUGH.
As you all are aware, both Ace & Blackbeard carry the name of D. Now, I'm not sure how pirate order works but I always found it slightly strange that Whitebeard sent out his commander of his second division souly to hunt down and take care of him.
Then I got to thinking…perhaps Ace is tracking him down for his own reasons? I'm aware not all D's are related (as far as we know as of yet, the only Ds we don't know for sure that are related are Blackbeard, and of course, Roger) but perhaps theres something between Ace & Blackbeard even if good friends. We are all puzzled at Ace's first name not being Monkey as well.
If not then I just got to thinking again...perhaps Blackbeard killing his own nakama was a roose, as we all know Whitebeard is a yonkou and Shanks and him are plotting something or at least trying to.
The Will of D is mysterious to all of us still, but perhaps Shanks & Whitebeard has had something in mind all along. Now this is pushing it but Whitebeard had two Ds in his possession as it was, when one got away he used the only weapon he had to get it back, another D.
We all along looked at Shanks giving Luffy his hat as a sign of affection, but maybe he did it cause he saw the potential in the young D and that he'd grow up strong and find him to return his hat. Yeah, yeah, if Shanks needed Luffy he'd find him without any problem. I know I'm not making a lot of sense and I'm just throwing stuff out there but I just feel theres a lot more to this.
I guess theres still too much left unknown.