Hem, yeah, maybe they mistaked a little, about the 5 dolphins.
And I thought the same things about Tobias on so many pictures ^^
The last picture is when they leave the spaceship with the help of Visser 1 (who is on the picture before)
The books aren't expensive at all:
Japanese Animorphs on Amazon (100 yen = 1$)
I had every book between 1 yen (yeah!) and 200 yen. Now it's just a little mode expensive.
And mine are in so good quality that I think nobody read them before.
And yes, there is the transformations, as you can see on the 2nd picture... and the animal is also on the side of the book (1st picture). In fact the books are really good made (except maybe for the front covers ^^'), it's collection books