I'm not sure ERod was is "homegrown," but those 3 do rival, if not beat out, Bello, Crawford and Houck.
ERod pitched 37 innings w POR and 48 w PAW, before his call-up. If you count him, then we can safely say we have the best 3-5 homegrown pitchers (now counting Whitlock & Winck, if ERod counts) in 7-8 years.
Again, I'm not bragging on the greatness of these guys, but it is noteworthy that as bad as our fram looks, now, it did just produce the best we've seen in 8 years or so. If you don't count ERod, Wink & Whitlock, we might be able to say 10+ years.