How come the predictions function doesn't return a prediction, but instead nil?

Ugh, this is a real headache tbh. >.<

What I'm doing is I'm trying to get the predictions function, of the code below, to return a value for which to counter the player, but it doesn't, and only returns nil. I am not sure as to why this is happening, and I've looked it over, but I didn't notice anything wrong.

Although, from investigation, it seems the BlockedPath function is the cause, but I can't see any way how why, and how to fix it.

What counter-measures do you mean? Well, as an example, I have it set up, in a table, so that the compiler constructs a string, then the string compare to a prediction; say the compiler says '14,' and the win is '7,' but the code doesn't pick this up, and goes for a random space (value) instead.

This is the code I'm using:

local Predictions = { -- This is the predictions table; not very efficient, but hopefully it does the job
    {'12', '3'}, -- The first value is the warning value, and the second value is the number to prevent the match
    {'13', '2'},
    {'14', '7'},
    {'15', '9'},
    {'17', '4'},
    {'23', '1'},
    {'25', '8'},
    {'28', '5'},
    {'35', '7'},
    {'45', '6'},
    {'46', '5'},
    {'56', '4'},
    {'59', '1'},
    {'57', '3'},
    {'78', '9'},
    {'79', '8'},
    {'89', '7'}
}
local Blocked = {}

function BlockedPath(value)
    print('Check for blocked path') -- Prints
    for i, v in pairs(Blocked) do
        print(v, 'blocked') -- Prints
        if value == v then
            print('Path blocked') -- Prints
            return true
        end
    end
    print('No block') -- Doesn't print
    return false
end

function CompareValueToPredictions(value)
    print('Compare values')
    for i, v in pairs(Predictions) do
        print('Predictions:', v[1], v[2]) -- Prints
        if value == v[1] then
            print('Prediction') -- Prints
            if BlockedPath(v[1]) then print('Blocked') return end -- Prints
            table.insert(Blocked, v[1])
            print(value, v[1], BlockedPath(v[1]), v[2]) -- Doesn't print
            return v[2] -- Doesn't return
        end
    end
    print('No comparison') -- Prints
    return nil -- Returns
end

function PreventPlayerFromWinning()
    print('Check for danger')
    table.sort(player1) -- Sort the spaces the player has ahold of
    local compile = '' -- To compile the names
    for i, v in pairs(player1) do
        compile = compile .. v -- Add to the compiler
    end
    for x = 1, 3 do -- If the first time fails, then try again another 2 lol
        local compareValuesToPredictions = CompareValueToPredictions(compile) -- Return the value
        print(compareValuesToPredictions, 'thing') -- nil thing
        if compareValuesToPredictions then -- Found match
            print('Prediction found') -- Doesn't print
            for i, v in pairs(script.Parent.Frame:GetChildren()) do
                if v == compareValuesToPredictions then
                    print('Prevent')
                    return v -- Return counter
                end
            end
        end
    end
    print('Failed')
    return nil -- Returns nil
end

This is apart of the code that I'm submitting to the Snack Break #22; however, the code isn't working as I wanted it to, and I can't figure out why. ;-;