Every fat creates a mixture of soaps. For example, that olive oil soap called sodium olivate is a mixture of sodium laurate, sodium palmitate, sodium stearate, sodium oleate, sodium linolate, and so on. You can make single OIL soap, but it's not too practical to make soap from a single fatty acid.
That's not a bad thing, necessarily. Over the centuries, people have learned by trial and error that a blend of fatty acids is often more desirable than a single oil soap, because the various fatty acids bring specific qualities to a finished soap.
Many of the online
soap calculators try to provide some idea of these qualities. Since you've used Soapcalc, perhaps you've noticed the numbers for hardness, creamy, bubbly, conditioning, cleansing, etc.? I explain more about these numbers here:
https://classicbells.com/soap/soapCalcNumbers.asp
I honestly don't believe the "conditioning" number as defined by Soapcalc is an accurate measure of conditioning or mildness. And the so-called "cleansing" number really doesn't measure whether a soap can clean the skin or not. So take the names for these numbers with a big grain of salt. That said, if you can remember the groupings of fatty acids represented by these numbers, these groupings can be helpful.
Mildness isn't defined by any one fatty acid nor by any one particular fat. And perception of mildness will vary with the person. Ethnicity, gender, relative humidity, overall climate, skin problems, the person's age, etc. all have a bearing on the perception of mildness.
There are some general suggestions for making a milder soap, but even if most people tend to agree with those general ideas, there will be at least a few who don't. So it's somewhat of a personal quest if you want to make a mild soap -- you have to learn what "mild" means to your skin.