Yea I can see some similarities but this is just a less extreme version of Coby and Garp, similarities be damned, Garp was not shedding tears fanboying over Roger, the way Coby is with Luffy.
And although Law isn't the embarrassment Coby is, WB stocks would plummet if we ever found out he was playing Law's role during the Yonkou saga.
Oda wants none of Luffy's peers to be on par with him when it matters most, he wasn't afraid of doing the same with Roger. All Oda does is tell but doesn't show when it comes to Luffy's peers, when it's time to show, they get relegated to a glorified cheerleader role.
Having said all that Strawhat fans shouldn’t get too excited, the crew ranks even lower in the hierarchy. The only difference is that they’re not pretending to oppose Luffy, which gives them a bit more integrity.