Because it is very rare for college OG to be a top NFL prospect. Most of the most talented college offensive linemen play the OT position. It is not until they project to the NFL that they are switched to OGs (See Cordy Glenn, Amini Silatolu, Senio Kelemente, Kelechi Osemele). This transition is where teams devalue that player to a later round because they are perceived to be less talented OTs rather than highly athletic OGs. Players like Steve Hutchinson, and Alan Faneca and David DeCastro are rare because they are supremely talented players who are the TOP OGs in college football. They probably could have been average OTs, but they were always played inside which made them plug and play top players to whatever team drafted them.
I hope this answers your question.
Sort of but what it makes me think is why use a draft pick on a DeCastro when you can get an OT to convert to guard who will be almost as good in a later rounds plus a star playmaker in round one. I guess if so many top NFL offenses didn't have mostly later round players at Guard it would be easier to understand. Our Guards in the Super Bowl were 2nd round and 6th round picks.
Actually the more I research it looks like if you are going to use a first round pick on an offensive lineman you should take the best Center.
On the other hand the Cards have had 5 different players be the primary starter at Guard in just the last three years and the oline hasn't been very good any of those three seasons. So maybe they do need to go get an A+ Guard since they are going to have #6 starting this fall.
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