What do you think?

Second post, thinking now that I must be done it as the first…great forum, lots of knowledge and nice people here, thanks to let me be part of the family. Here is part of my columnar buddies 😊 and, if can I ask for help, I´m not sure about the ID of the little yellow spined one at the middle of the ...

Hi, first post here, lots of good reads before posting, and with apologies to make my first post a question…(and for my English ☹) I recently received this guy from a friend, a nearly four years old grafted saguaro, do you think it would be a good candidate to degraft it by vascular bundle method? N...