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Here is the cmvision/Blobs message structure:

std_msgs/Header header
  uint32 seq
  time stamp
  string frame_id
uint32 image_width
uint32 image_height
uint32 blob_count
cmvision/Blob[] blobs
  string name
  uint32 red
  uint32 green
  uint32 blue
  uint32 area
  uint32 x
  uint32 y
  uint32 left
  uint32 right
  uint32 top
  uint32 bottom

When you access your cmvision::Blobs struct like so pow(lastobjectpose.x-lastFollowerPose.x,2), you are implying that the Blobs message type has some x member. However, the x and y that you are looking for are in actuality in lastobjectpose.blobs[some_index].x and so it goes for y. Hence it might make sense for you to instead loop through lastobjectpose.blobs, using lastobjectpose.blob_count as your bound, i.e,

for (i = 0; i < lastobjectpose.blob_count; i++) {
  //Do your stuff.
}