Of course, 17% is less drastic for a guy who weighs 150 than it is for a guy who weighs 300. We know this - a 10% off sale doesn't mean shit at the candy store but it makes a pretty big difference when buying an appliance.
Even still, this kids weight isn't a surprise to the Rams - they know how much he weighs.
And honestly, I don't think the Rams drafted this kid for his projected force measurables - he isn't going to be trucking anyone - we all know that.
If gaining weight slows him down, let him play at 160.