Menahot 5: Gemara Mechanics - Comparative Cases

What happens in the case of a person who needs purification from tzara'at - a whole process - where the order of the tasks may make a difference in terms of validity - in the goal of using the case of tzara'at to answer the question the grain-offering, and ultimately rejecting it. Also, another parallel to animal sacrifices... in terms of paving the way for the sanctification of sacrifices, including, for example, melikah (of the bird). Plus, a kal va-chomer vs. verses understanding, where neither is quite rejected.