The lads goal scoring record speaks for itself. He appears to be settled in Wellington. Its not like they are offering up a 3 year contact. Its a 10 game emergency deal. Seems like a decent option to me - but they go for somebody they have already had then released - essentially deciding that he not good enough? Phoenix are a shambles.
You're obviously his friend/relative given all four of your posts are about him. Don't worry, you're not the first person to do that here.
If they signed Harris, they wouldn't then be able to sign Jones if the transfer eventually goes through. We'd be over the foreign quota number.