The defense isn't denying that Chase wrote checks by way of the CUSTOM account, which was separate from Joey's more important and personal account CONTACTS. An account that Chase apparently already had the password to.
That is being admitted to.
What the defense claims is that YES, Joey did give Chase checks to use to pay himself and apparently Metro. The only way those checks are a problem, is if they are cashed, and we know that one check was cashed prior to Joey going missing and Joey never changed his passwords, or spoke to his bank rep of fraud. This indicates that he was OK with the check writing.
And Chase only accessed that one account. He wrote checks in keeping with what was owed to him. He never accessed the CONTACTS account. He never used credit cards. The total stolen was about 20K, and he was expecting so much more that year in work. Doesn't make sense to kill a guy for 20k, when the work you might do with him over that year could add up to a few 100 K
The arrangement was a little unconventional, but makes sense to me.