KKoran , absolutely correct extremely difficult to judge from the distance. I would add that it is also not the first task of a TWR controller, and by far , to monitor visual APP alignments of VFR traffic. A VFR visual APP is not a PAR
As to the audio : call sign confusion , who never did that jumping from one aircrfat to another ? and forgetting to push the "next" on the VHF ( or just not pressing it hard enough) ? common , we all did that , and not only once. OK he sound tired , or maybe just focusing on something worrying him on the aircraft. Not his day but not worth all those comments about age and asking to pull his licence. I'd fly with the guy anytime and would almost certainly learn something in the process. Great guy and great GA pilot. Check him on the EAA web site.