I watched him two years ago when he split time with Bryan Randall. He has the same type of arm strength (although he's right-handed) and similar elusiveness. He didn't seem quite as elusive as Mike was (and has been). He is fast though.
The thing that I saw was that he was definitely not where he needed to be mentally. There have been a lot of knocks on Mike about his mental part of his game. But, Marcus is not even where Mike was when he was at this stage in his career.
I'm hoping the year off will really prove to be a blessing for him. He did show sparks of having great talent. But, the verdict is out on whether he can focus that talent and really improve.