From giving him the necessary means to threaten Italy with invasion, his ability to invade and secure Sicily on two occasions and from whence he accompanied Anthemius with an army from the East as well as forces of his own to install Anthemius as Emperor.
This situation enabled him to supply him with the necessary means to pose a threat to Italy through invasion, which ultimately led to his success in conquering and securing Sicily twice. Furthermore, he accompanied Anthemius on a military expedition from the East, along with his own forces, to install Anthemius as Emperor.