It is hard to get to level 50.

[MongoJerry]

Isn't Princess level 51?  I know I'd have problems tanking her at a -5 or disadvantage, since you suggest level 45 for Maraudon :(

Oy! There's a common misconception that one has to be able to clear an entire instance before ever starting it. It's just not the case. Instances like Mauradan and Blackrock Depths are designed to be done piecemeal at different level ranges. The purple side of Mauradan starts off at around level 42 and ramps to around level 45. The orange side starts at 45 and ramps to around 49. There are lots of quests to complete there and minibosses with good loot to kill there long before one would even think of doing a Princess run. Besides, you'll probably want to get your own scepter that will enable you to do your own quick Princess runs later -- and that involves running both the purple and orange sides. It's only after Bob levels a couple more times that I would suggest a Princess run, but then hopefully his adventures on the purple and orange sides will mean that he'll be equipped with a scepter to make those runs fast and easy.