Renovateur has bees wax in it (not a very big amount but it has) that's why you see the dusting effect (f.... i created a shoe care term hahahahah)!! the bees wax brake off and creating the dust you see in creases or where the shoe flexes (less noticeable on tan shoes)!
All conditioners more or less produce this dusting effect! The conditioners that dont produce so much dusting effect are the 1909 leather lotion from Colonil and lexol (i have never used bick4 though )
On the other hand you can use dubbin but its quit difficult in handling (no to lees noticeable dusting effect)
i hope i helped a little bit!
term makes sense!
i'll need to try 1909 leather lotion from Colonil, but which lexol?