But is there a guideline or rule that states you MUST mention which comparable's are given emphasis or weight? What if all comparable's used offer similar emphasis?
Look at it this way (and let's keep it simple; let's just talk about the sales comparison grid and a residential property; you are only using one approach):
You have a grid and you make adjustments.
In your comments within that approach, you are going to:
(a) Describe/support your adjustments (why does Comp#3 get a 5% location adjustment? Oh, because it backs to the freeway. And, how did you arrive at that adjustment)?
(b) Discuss any additional items that are relevant to this approach (like, there was a sale right next door to the subject that you didn't use; you didn't use it because it turns out it was nasty divorce and the spouse who lived there made it next to impossible to sell; so when it did sell, it sold at a steep discount. Not a sale to use as a comp, but since it is right next door, if you don't tell the client why it isn't a comp, they are going to ask why you didn't use it).
(c) Provide your rationale for selecting the point-value you did. As I exampled, if you a model match, the expectation is that your opinion of value would give that adjusted price a lot of consideration. You would explain that you did or didn't for whatever reason.
(d) When you are done describing how you distilled your indicated value by sales comparison approach from the adjusted prices of the comparables, the reader should understand why you came in at where you came in, and why it makes sense.
The above is a reconciliation of a single approach.
In the formal reconciliation, you would also reconcile the different approaches, how you considered each (typically based on how best they reflect the specific buyer-type and also how good or not-so-good the quality of data is), and how each of those approaches are distilled into your final value opinion.
Usually, for residential mortgage work, the final value opinion is 100% dependent on the SCA. So, if you reconcile your analysis in the SCA section, you have communicated to the client/intended user why your point value is where it is at.
If you are giving each comparable similar emphasis, that would still require an explanation of why they are considered equally as opposed to one not being any better than the other.
For example, if your gross adjustment of Comparable #1 is 20%, and your gross adjustment for Comparable #3 is 2%, and you are giving them equal consideration, you would want to comment on why the comparable that required 20% gross adjustments is as good (equally good) as the one that only required 2% adjustments. There can often be a very good reason why this would be; but unless you explain it, your client/intended user may not understand (or worse, come to a different conclusion).
And that is the bottom line: Your reconciliation should make it clear in no uncertain terms why you concluded the point value you did; this would include discussing which comps are better than the others and were considered to a better degree, or why all the comps are equally good and were considered equally on a collective basis.
This is what we do in an appraisal report.
If you are doing a restricted appraisal report, then you don't have to do that.