Has Ari Balogh arrived too late? That's the key question for Yahoo's new CTO, freshly hired away from VeriSign. Balogh will take charge of all of Yahoo's engineering functions, essentially leaderless since former CTO Farzad Nazem quit last May. The new blood could bring some much-needed shakeups. Presumably, current tech executives Usama Fayyad, Qi Lu, and Ash Patel will report to him. One wonders how long that situation will last. Patel, in particular, has been checked out for some time, according to sources at Yahoo, and Balogh's hire may be his cue to leave. Balogh will have another challenge: VeriSign's reputation.