The bow parking like this is spotting aircraft while others are landing and when you want to keep as many on deck as possible when that is happening.Is there really movies or photos of the Russian carrier with six aircraft parked on the bow? .
Although I doubt whether that was the case during these photos. My guess is that they were working through particular training and evaluation exercises and simply wanted to keep all five or six together while doing so.
When they are launching, they will use the two bow positions and aircraft will not be spotted there.
I have seen up to nine SU-33s on the Kuznetsov at a time with two SU-25s and five helos.