You probably noticed that Yoga does not need to be devotional by itself.
You can focus on the poses, breathing techniques, meditations techniques with great results without feeling devoted to a God or Master.
When you touch on Bhakti Yoga, you definitely enter a devotional stream with singing and celebration.
Mataji is here to sponsor that stream.
Does it mean that Babaji doesn't? Of course not :)
Their combined lines of energy simply give an extra boost to this devotional line which could otherwise have been less present in the Yoga stream.
http://vitalcoaching.com/babaji.htm
To your Yoga
vitalcoach