This is my first fanpost, so don't be gentle on me! How else am I going to improve?
I'm going to compare two types of bigs (centers or power forwards) and make an argument for what Blazers need.
You have a Gobert type that has length/height and shot blocking. This is what they do, and have done, their basketball career. They are offensively raw and probably at most going to give you dunks and free throws, both good things. These guys take longer to develop, thus tagged with a player who has 'potential'. I see Omer Asik in this category, along with Roy Hibbert. Course, you also have the Has, Thabeets, and countless other tall centers/forwards who really aren't meant for the NBA. You also have the offensive giants, without any defensive mechanics....hmm, who could that be? Hint: Backwards first-last name.
Then you have a group of shorter, possibly more skilled hustle players that had to work harder against other players through development. That hard work paid off and you get a player with a lot of rebounds and put backs. JJ hickson, anyone? We all know how hard he worked for the blazers. Paul Milsap, who is skilled offensively, can be thrown into any team and improve win count. These players out hustle the other teams centers, and their offensive ability can take off pressure from perimeter players. I think of Kenneth Faried as a good example of a solid player that will go against a bigger player without too much of a problem.
My vote for the Blazers is the first category. I think you put a good role player, specifically inside presence and shot blocking, next to Aldridge. Height matters. Some of these combine numbers can throw people off. I am stating that pure height combined with length, not athleticism, is what the blazers need. Have you ever tried to drive to the basket against a player over 7 ft? Regardless of anything else, a player is going to hesitate for a half a second longer than a 6'9 big. Of course, this big needs to be able to have lateral quickness to be a force in the paint.
What do you think? Which big do the blazers need more?
With the draft lottery today Rudy Gobert and Alex Len both have the defensive potential the blazers need.
FA/Trade targets I'd consider in this category are Omer Asik, Roy Hibbert, and Javalle Mcgee.