Even though he's not speaking as a "guest pastor", he still get to make a speech. And making a speech at such a major church-sponsored event will still, IMHO, be "legitimizing" him and, by extension, his demonic abortion/homosexuality stances.
As I noted a post ago, I emailed Saddleback about it. If they answer me I'll post the answer here.
I guess one should not allow their chapel to be used as a whorehouse during the week even if the proceeds do go towards the purchase of new choir robes?