In a normal shonen Garp would take a fat L to hype the antagonists but we know Blackbeard and his crew are different, Oda is fine drawing them taking Ls
And while this is nowhere comparable to Shanks, this is also the first time Garp gets to seriously fight on-screen. In Marineford he was held by his feelings for Ace and his only real action was punching Marco once lol. Considering the fact he’s a good guy, rival of the PK, respected by Roger and WB very unlikely Oda make him looks bad.
That said he s old and the mentor losing while passing the torch to the young generation is common shonen trope. And it would really be awful if one can invade and destroy Blackbeard HQ without consequences
So Garp may get defeated, but not in a hype tool way. First I’m sure BBP will gang up on him and not go for a fair 1 vs 1. They are dirty fighters.
Second I wonder if the slaves we see in the chapter will be used as hostages. Pizarro should be able to trap them with his ability.