Looks normal to me, I'm not seeing any saddling, but it does look like in the last picture that that egg may have started to draw down. If you want to put them into lockdown a little early it won't hurt anything.
The air cell was way more prominent with the saddle sac at the early stage where it looked just like a saddled I would put on a horse. They are shipped eggs not from my flock.
The last pic is part of the saddle sac it has been like that since day 7 the rest has just grown to where if you didn't see it before you would probably never know it was saddled
Your egg looks good . if movement is good I would go ahead and lock down to hatch. The fluid line is pretty much where it should be .If the other eggs look the same I'd say you are right on track .