Assuming the Titans, Bucs, and Raiders lose the rest of their games this season, the upper range of the Strength of Schedule possibilities for the Titans to get the #1 looks like this:
TEN .486 124-131-1
TB .502 127-126-3
OAK .574 147-109
To achieve this record, the games break down as follows (the Raiders were not considered as they seem too far behind):
Week 16
WAS defeats PHI (wash for TEN, +1 W to TB)
BAL defeats HOU (+1 L to TEN, +1 W to TB)
PIT defeats KC (wash for TEN, +1 W to TB)
CAR defeats CLE (+1 L to TEN, +1 W to TB)
MIN defeats MIA (+1 W to TB)
NE defeats NYJ (+1 L to TEN)
STL defeats NYG (+1 L to TEN, +1 W to TB)
DAL defeats IND (+1 L to TEN)
DEN defeats CIN (+1 L to TEN, +1 L to TB)
Week 17
WAS defeats DAL (wash for TEN, +1 W to TB)
SD defeats KC (+1 L to TEN)
MIA defeats NYJ (+1 L to TEN)
STL defeats SEA (+1 W to TB)
Any games not list, mainly divisional games between NFC North, AFC North, NFC South, and AFC South teams, have no effect as both teams participating in the game we on both the schedule for the Titans and Bucs, leading to no net gain in wins and losses.