So if a tight end was lined up on the line of scrimmage he would be eligible? Would he not be covered by nine as well?
I think you are confusing your terms. Remember, an "end" needs to be on the end of the line. If there is someone on the line outside of him, he (your tight end) becomes an interior lineman. We frequently put names on players which are not within the definitions.
Only players in the backfield and on the end of the line are eligible to catch a pass, and only if they are numbered 1-49 and 80-99.
In your figure, it also says the opposite tackle can be eligible. True, but you can only be eligible on the end of the line if numbered correctly. Technically, he is an end but not eligible unless he is numbered correctly and another player on the line is numbered 50-79 giving a total of 5 appropriately numbered linemen.