What was ironic about the fact that the one surviving ship of Magellan's fleet was piloted home by Cano?

Juan Sebastian del Cano (sometimes called Elcano) was a
Spanish sailor who was the pilot of the Concepcion, one of the five
ships on the voyage to circumnavigate the globe led by Ferdinand Magellan.  The
expedition departed in 1519 and wintered in Patagonia, South America.  There, talk of
mutinying and returning to Spain began among the men.  In March of 1520 some Spanish
captains mutinied and Cano was considered one of the ringleaders. Magellan put down the
mutiny and killed or marooned several of the captains.  Cano was eventually pardoned by
Magellan after being punished with forced labor on the mainland.  Cano was later given
command of the ship Victoria, mainly because other captains had
been killed or marooned after the mutiny.  In April, 1521, Magellan and most officers
were murdered in the Philippines.  The only ship to complete the journey around the
globe was the Victoria, captained by Cano.  The irony of this, of
course, is the fact that Cano, who participated in a mutiny to return to Spain, which
would have ended Magellan’s historic voyage, was the leader of the expedition when it
ended in 1522 and was even given a pension by Emperor Charles V.