Logic of the Draw

Provided courtesy of Real Clear Daf

Daf Yomi B’iyun (by Real Clear Daf) explores gorel (drawing of lots). Not the "Gorel HaGra," but, a gorel that brothers use when dividing their inheritance.

Everything about the Gemara's discussion seems simple...too simple. We don't need a Tanna to state the painfully obvious. So what is really going on here?

There's also what appears to be a contradiction in the words of the Rashbam.

Source sheets