I don't think that she stalls him. Even without her, Lecan would still be in this town, since he wants to learn more medicine and magic under Shira's tutelage. Furthermore, since the first volume, Lecan has been a go with the flow kind of guy, who doesn't mind at all taking the time to do things correctly (he stayed a long time with Ruby, for example).
I really don't think he forgot anything, he's just not in a hurry, and wants to be sufficiently prepared. The only time he thought Eda would be detrimental to his goals - when Shira told him to teach Eda - he protested until Shira assured him that it would be good for his own development.