Hi Jane,
Thanks for your input, your opinion is highly appreciated.
You mentioned how doing a site: search isn't accurate, but rather the results of a submitted sitemap I'm assuming via Webmasters. We're not able to see specifically which URLs Google chose to place in the index and which they didn't, am I right? They simply show you the number of URLs submitted and the number that are indexed.
Regarding Mandy's higher authority, that does make a lot of sense.
I absolutely concur with your questions, and to a degree I have established that stance. I need to remain consistent so that the client can better understand the reasoning behind my concerns.
Thanks for your help!