Cloud would send Junior to an early grave. It'd look very similar to way Cloud ****ed up Julio Gonzalez several years back.
Chavez Jr. uses his size to win fights. He is not going to be much bigger than many 168 pound fighters and Dawson is a bigger man with bigger shoulders at 175. I think Chavez Jr. loses most of these fights as he won't have the extreme size advantage that he has at 160. At 168 he may be bigger than a few, but by no means does he outsize many at 175. Note-Height does not equal size. Cloud has bigger shoulders than Chavez Jr. and he is shorter.
The rule that you cannot hold any title with the WBC any more, it seems although the WBC is using the rule for their own agenda to gift people titles which would happen if Chavez JR steps up, its wards choice but no doubt he will be highly recommended to drop the WBC.
Bute is a southpaw with a good jab, good power and movement. If Froch hasn't permanently dented his chin then I think he gives Baby Chavez the business...