I guess this is where we may disagree and thus the differing view on Miz. But I see your point.
As far as depth, we may have it better than others, but I don't see the depth as great. There is Uribe, Koenig. And assuming Megill is healthy. Then Ashby. Solid, But after that?
DL Hall is injured, Rob Z has been fine, Anderson was injured and was loosing effectiveness prior to that, ditto for Mears, and then S. Miller is out. So a guy with Miz's stuff who can actually be lights out, that is a great weapon.
And to clarify, I don't know that 2/3 is exactly what I was saying, but rather like most starters you go good in most starts (but not every start obviously). In relief you can mask that more - give a guy three batters if isn't going great, and let him ride for 1-2 IP if he is going great. I was using the 1/3 and 2/3 just as an example since I would imagine a reliever pitches 2-3 times in a 5 game series, and 3-4 times in a 7 game series. Anyway, I've overexplained that to death.