Mammillaria ID Please - Thanks

Hello,
Can you help me to identify these youngs mamillarias ?
(I thing that 2 & 3 are the same)
Thank you in advance for your help.

1)


2)


3)


4)


5)


6)


7)

No. 1 is M.bombicyna

Your photo's are slightly out of focus, but I would suggust the following...

1 and 5. M.bombycina
2, 3 and 7 forms of M.spinosissima. 1 & 2 could could the form tepoxtlana also known has M.crassior while 7 could be the form known has pilcayensis.
4 and 5. M elongata

My suggestions would be:
1. M. bombicyna
2. M. backebergiana perhaps - needs more light!
3. M. backebergiana
4. M. elongata
5. M. elongata
6. M. zeilmanniana?
7. M. spinosissima ssp pilcayensis

My reasons for 2 & 3 are that there are only about 10 radials and a few centrals, though it is difficult to see in photo 2.
For 6, the flowers are forming and I hope they are going to be purple red.

Thanks to you for your answers !
It is very kind from your part !