Just want to say that sometimes due to circumstances it may take a while for a receiver to take off.
Consider the following stats from Mould's career, paying special attention to the first couple of years, then look at Sammy, taking into consideration his 3rd year injury. Sure, I know things were a bit different back then, but make the comparison.
Receiving
Year Team G Rec Yds Avg Yds/G Lng TD 20+ 40+ 1st FUM
2007 Tennessee Titans 16 32 342 10.7 21.4 46 0 3 1 21 0
2006 Houston Texans 16 57 557 9.8 34.8 29 1 6 0 33 1
2005 Buffalo Bills 15 81 816 10.1 54.4 55T 4 5 1 38 0
2004 Buffalo Bills 16 88 1,043 11.9 65.2 49 5 12 2 53 1
2003 Buffalo Bills 13 64 780 12.2 60.0 49 1 10 1 35 0
2002 Buffalo Bills 16 100 1,292 12.9 80.8 70T 10 14 6 64 1
2001 Buffalo Bills 16 67 904 13.5 56.5 80T 5 13 5 42 1
2000 Buffalo Bills 16 94 1,326 14.1 82.9 52 5 23 4 62 1
1999 Buffalo Bills 14 65 994 15.3 71.0 54T 7 13 6 44 1
1998 Buffalo Bills 16 67 1,368 20.4 85.5 84T 9 22 8 54 0
1997 Buffalo Bills 16 29 294 10.1 18.4 32 0 1 0 18 1
1996 Buffalo Bills 16 20 279 14.0 17.4 47 2 4 1 11 0
TOTAL 186 764 9,995 13.1 53.7 84 49 126 35 475 7
Sammy
2016
Bills
28 Receptions
430 Yards
15.4 Avg
62 Longest
2 TDs
2015
Bills
60 Receptions
1,047 Yards
17.5 Avg
63 Longest
9 TDs
2014
Bills
65 Receptions
982 Yards
15.1 Avg
84 Longest
6 TDs
Career
153 Receptions
2,459 Yards
16.1 Avg
84 Longest
17 TDs