Is it far fetched to imagine there could be a very similar situation between Garp/Roger and Kaido/Xebec ?
Roger trusted Garp with his own son and Garp took care of Roger's Son as his own, is it not possible for the similar situation between Xebec and Kaido, Xebec might've trusted Kaido with his own son and Kaido took care of him as his own.....
Kaido as we've seen seems to have deep connection with Xebec to the point he wants world domination the same dream as Xebec, so maybe thats why Xebec trusted Kaido in return as well
In return it gives us chance for us to see Luffy VS Xebec Son and also Flashbacks of Xebec VS Roger & Garp
Roger trusted Garp with his own son and Garp took care of Roger's Son as his own, is it not possible for the similar situation between Xebec and Kaido, Xebec might've trusted Kaido with his own son and Kaido took care of him as his own.....
Kaido as we've seen seems to have deep connection with Xebec to the point he wants world domination the same dream as Xebec, so maybe thats why Xebec trusted Kaido in return as well
In return it gives us chance for us to see Luffy VS Xebec Son and also Flashbacks of Xebec VS Roger & Garp