1) Luffy took out Crocodile. This made a vacancy spot in the Sichibukai system.
Blackbeard then took Crocodiles place which then allowed him to gain permision to enter Impel Down legally.
2) Luffy causing a riot and reaking havoc in Impel Down allowed Blackbeard to do what he wanted to do with minimal interaction with authorities.
If Blackbeard continued chasing Luffy he would have been captured or killed by Vice Admiral Garp or Admiral Kuzan/ Aokiji or both.
Blackbeard then took Crocodiles place which then allowed him to gain permision to enter Impel Down legally.
2) Luffy causing a riot and reaking havoc in Impel Down allowed Blackbeard to do what he wanted to do with minimal interaction with authorities.
If Blackbeard continued chasing Luffy he would have been captured or killed by Vice Admiral Garp or Admiral Kuzan/ Aokiji or both.
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