Hi :)
What a cutie! I have a breeding pair of lions and although I agree that this baby has some pouch staining he/she also has some lionish characteristics. Determining a lion from a standard grey can be very tricky especially in pictures (even with the best of best camera)and some argue that there is really no true difference. As a joey, lions can look like a standard grey but the fur color does change as they get older. I look forward to more pictures :)
Here are some pictures of my lions :)
Kovu
Kiara
Kita one of their 4 week old joeys