Rondo's legs still look skinny as all heck.
He looks like one of those tools I hated in HS/college that drank protein shakes and did bench presses, push ups, and bicep curls costantly.
As a guard, lower body strength is just as important than upper body, if not more so. Look at your two premier 'big' guards - Billups and Kidd - they are built like a house...strong foundation.
Even your other defensive stalwart guards - GP and Eric Snow... strong legs.
Rondo will continue to get beat up until he bulks up from the waist down.