Marvin Harrison was a robot built to play WR. You had to see him in person. His route running and hands were flawless. The connection him and Manning had was something to watch. He's top 10 all time in receptions, yards, and TD's. Not just receiving TD's... touchdowns period, in the history of football.
Demaryius Thomas could average 10 TD's a year for the next 11 years. He still would not have as many career TD's as Marvin Harrison. Harrison and Wayne is one of the best WR duos in the history of football.