I think so too -- mine like I said were showing a preference for the pad just not fully trained. I think that is the best thing about raising them in a play yard with most of it covered in pee pads. They have their bed area and their eating area and they just naturally pee on the pads. Then they tend to prefer a pad when you let them have more room to roam. But if they get too large an area, mine normally would just go ahead and pee. The only one that fussed for something to pee on was that little girl. I should have kept her!
My problem with my last litter was I had too many wanting females before the litter was ever born. I should have still kept one but I went ahead and placed them all. My boys think I am crazy here a year and a half later, buying a little female myself! Timing had a lot to do with it too. After I lost my momma dog, I was not wanting to replace her. I needed to get some time between them so I would not be comparing, you know what I mean? Going off track again, sorry. But yes, I do believe some can be trained early. I just have not had the best luck at getting them fully house trained that early myself. I start thinking progress is made, and then ..... I get a surprise. I won't get concerned for another month. I usually have them house-trained for the most part by 6 months. My adults will occasionally have accidents too. I found it funny as you described the same place for your adult's accidents. Mine too -- right by the front door. I do not let them out the front door nor use a puppy pad there. So, why that is where the "accident" happens, I don't know. I sometimes think Ben is doing it on purpose to say he did not like me being gone -- I usually leave by the front door. So maybe he equates that with me being bad?