Re the lack of records for James
I was helping someone a while back who couldn't find an ancestor.
Long story short, the ancestors father died and his Mum remarried.
The chap was partially reared under his new father's surname.
Looking for records was a nightmare as he would flip from using his birth name, to his adopted name and back again.
Not saying the same applies to James but a variant might be possible.
Re the James with Maggie and Isabella in 1911 ~ have you researched these two ladies ?
Tara