Obi-Wan does not have any issues, he is the perfect Jedi. He's slightly cocky, I'll agree, but you're going to appear that way if you have trained yourself to be completely self-confident and without fear. Obi-Wan is not envious of Anakin, you dont tell the person you are envious of that he has become a far greater Jedi than you could ever hope to be and smile. If he had been living with envy of Anakin's talents for a decade he would have choked on those words. Obi-Wan loved Anakin like a baby brother, he cared for him for years the best he could. I dont see any traces of Anakin being held back its obvious he would have failed the test of spirit because of his fear and that would have only made him angrier. Obi-Wan understood his Padawan and knew that he simply did not have what it took to be a Jedi Knight in AOTC. Moreover, why should anyone expect Obi-Wan to understand why Anakin is upset at not being a Master? Jedi are not supposed to be covetous or ambitious indeed isnt their maxim 'there is no emotion; there is the force?' Obi-Wan exemplifies this in the coolness he shows after basically killing his best friend. He loved Anakin but by time he leaves its already past tense. He is a Jedi, it breaks his heart, but he gets right back up and returns to the force the way any Jedi should. Lastly, why should Obi-Wan save Anakin? Which Jedi in their right mind would rescue someone who's eyes were blazing yellow encircled by red? That is the trademark expression of a Sith that has been completely corrupted by hate e.g. Darth Maul. Anakin was not climbing up the bank to save himself, his expression illustrates this point, he was climbing up the bank to kill Obi-Wan. His entire life he blamed Obi-Wan for all his shortcomings and it wouldnt surprise me if he spent the next 20 years blaming Obi-Wan for taking Padme from him so he could not use his 'new powers' to save her. Obi-Wan did his best. Obi-Wan was the best.