Courtney Paris is great. If I were teaching post players how work in the post, I would use tape of Paris. However, it would be insulting to act as if we didn't know what her liability was.
Now as far as the three guys I mentioned, they all can be contributors and in Tiny's case we expect him to be a huge contributor. Now anyone who has ever played organized basketball, and has played the post position knows that the most running on the basketball court is by post players. Post Players have to run baseline to baseline, block to block. Often Big guys have to cover the inbound pass on the press, but still have to get back to protect the basket. After about 4 or 5 times down the court, your lungs start to burn and you start to breathe out of your mouth. Then you get slower. Now mental fatigue steps in and you start figuring out shortcuts. You start walk or slow jog on offense so that either the team has to wait on you, or they shoot quick and you have less ground to travel on defense. You don't battle as hard for boards. You bend at the waist for loose balls instead of getting on the ground. All of this is detrimental to a team and a coach is not going to tolerate that. In watchig Gallon and Big O, they have both done this for the times they have been on the court. Now Big O is ahead of Tiny in my opinion with conditioning. His last few games he ran the court well.
Willis reminds me of Marcus Dove when he first came to OSU. Marcus was a skinny ans Willis, but took a redshirt year to hit the weights. Willis is a long guy and adding bulk would definetely help him become a more versatile player. Willis's legnth and height is better than alot of post players, but if he were go get caught in the post against a post player or even a more bulkier guard, like Muenelo, there is one phrase those guys will call, "mouse in the house". Alot of time undersized guys like Willis get caught in the lane and foul to prevent being overpowered. Bulking up will help him with these issues and help him be a better rebounder, IMO.