The more I have investigated the matter the more I have become convinced that using quality beeswax by itself is the route I will take.
Mink oil
Neatsfoot oil
Lard ,tallow are all Perishable and will become Rank .Beeswax with nothing added is non perishable and will never become rank.
Any oil added to beeswax will soften the Leather and introduce bacterial breakdown to the leather to the degree that the oil penetrates the leather and then starts to go bad(perish ,go rank etc)
I do not want to add a perishable ingredient to a non perishable .
It seems as though anything added to Quality Beeswax works in spite of itself and not because it was added to the Beeswax .
The downsides I see to using beeswax are that it can be considered expensive,not easy to get quality filtered beeswax that has not had something added to it.
More difficult to apply to leather than just using liquid oil or a paste.
If leather is totally saturated in beeswax and extremely hot temperature that would approach the melting point of beeswax then obviously the leather would be less stiff until the temp was lowered again.
For my use of protecting the stitching,and helping to preventing bacteria from getting inside the leather and to provide a high degree of water resistance plus (in my opinion)a pleasant smell,the Beeswax with nothing added to it will get my use.