You don't know that and it's all speculation based on prior events.
My speculation is that the realize their Achilles heal the last two years on defense has been the center of the line and they are looking to fix it and get to a complete and special defense.
Again, Hankins may not be ideal but he represents the most they have put towards the dt position in a long time and I for one am optimistic that's an indicator that they are going to do more.
achilles heal at times but the bigger issue was Brown and lewis being lost for the year and scrambling for help pus Diggs falling off but and afraid of contact.. the run defense surprisng to most posters here was actually over 19 games as good as the eagles run d actually better,. Shocking huh? we need to get better at every position yearly but saying the middle wasn't the BIGGEST issue when we saw diggs fail to make those 2 big plays and kittles burning 3 of our DBS on huge catch and late got beat a lot..
so looking back over 17 games injures effected the team more than anything the offense blew the playoff games not the middle of the defense they shut down TB and SF
I wouldn't call what our group at DT was last year as scrubs or trash.. sure the right NT/DT1 come up grab him But,
we were top 7 last year on defense, even with all those injuries and ended up graded better then then the eagles in the run game. Our run defense was 4.4 YPC, theirs was 4.6, we gave up 9 rushing tds, they gave up 14, yards about the same.
I realize the need but we had a very good defense against the run at time especially the playoffs.
the eagles value the DT so much it keeps being talked about, but our D ended up closely ranked EVEN with some of those bad games in the middle of the season.