[Mutant Masterworks - Nuke]

So at the end of the round when advancing the nuke can you place it overlapping characters? I know characters can not end a move overlapping it but want to make sure its not possible to body block the nuke from moving a certain way. 

[LOS for Attacks]

Per the online rulebook (9/11/20) pg 19 it says characters must be in LOS to target with an attack. Pg 22 Line of Sight 2nd paragraph says to add the size of the character and terrain together to determine LOS. So say Green Goblin (size 3) is on top of a size 3 terrain that would count as size 6. Would that then mean that unless someone is on the same terrain with him they cannot attack him due to not being able to draw LOS through terrain larger then their character?