Since when have you played the FAQ as holy text/official, Soro?
Since prior to Gleemax.
Also "holy" is a strong word there when combined with the word "play" since we both know I'm in favor of a gentleman's agreement and allowing any houserules that allow people to play together happily. FAQ is part of the official rules and it doesn't matter if you disagree or agree with D&D's rules, your opinion will never change that fact and that is all there is to it.
I don't see anything conclusive on RC 132 or CArc 72. Perhaps SorO was referring to the clause that says you can't qualify for PrC's that require spellcasting with spell-like abilities, or that you can't lower your Caster Level beyond the smallest CL necessary for you to cast the spell? DMG 282 is about creating magic items.
You got the RC/DMG quotes right, there is a minimum CL. However, you looked at Spellcaster Level in CA which isn't definitive (SLAs are not arcane, invocations are not Spells). These two
pages have something in common.
I'll give you a hint. The topic deals with something that can ambiguously mean two different things, if we ever had
anything that tilted the balance towards one or the other, people would explode. Screaming over what rules you're supposed to ignore (answer: none of them), which are wrong, which apply, and so on.
I agree it's not the strongest point unto it's self (spellcasting isn't a feat/prc!) which is why I'm playing suggestive educator, but if you're pursing intent it is a consideration that section I speak of will have you reopening the PHB/DMG to reread the minimum CL areas a second time. And when you do, you may or may not hear me echoing one of my common sayings.
Requirements are not effects.It's why I've been on the defensive side of the fence for years now. Versatile Spellcaster is the only thing I can learn any support in, and that is due to the FAQ supporting it and me struggling with the empathized 'is'. Which may seem ironic, but I really do my best to stay neutral and follow the rules where they go. To me, intent is a puzzle that needs worked out and that's what holds my interest, not intentionally misreading things and slapping additional zeros to numbers or other similar bullshit.