So because he hasn't been given a chance he shouldn't be? Please enlighten me, if EJ was drafted to Baltimore how many games would he have started the last 2 years? How much game time would he have seen? Tyrod preformed admirably in his preseason games thus far, you can look some of that up if you want (to your 2nd point). RavensInsider did an interview on WGR earlier this week talking WRT Tyrod. He has watched him practice and prepare for 4 years now. He believes that Tyrod would perform well, but you'll never know until you let him do it.
In the end, Tyrod has been stuck behind a Super Bowl MVP QB for his entire career. He has no significant NFL game tape, good or bad, to speak of. EJ has NFL game tape. Some is good, some is bad. If you want compelling NFL game film that shows EJ is better then watch his highlight reel, if you want compelling NFL game film that shows Tyrod is better than EJ watch the Houston game from last year.