Actually you couldn't be more wrong. Tannehill has all the pressure in the world being drafted #8 overall by a team desperate for a franchise QB. Either he becomes a franchise QB or he becomes a bust. There is no in between on this one. You don't draft a QB at #8 to be just decent or slighty above average. You can draft that type of guy in the later rounds.
Every top QB drafted should feel this way. Luck has pressure. Griffin has pressure. Tannehill has pressure. It's always been that way.